- Open Access
Modeling and Supporting Web-Navigation
© van Oostendorp and Aggarwal. 2015
- Received: 19 November 2014
- Accepted: 5 July 2015
- Published: 29 July 2015
Navigation within a website is an important factor for the success of a website. Faster and easy web-navigation leads to better usability and reduces cognitive load on the user. Several cognitive models exist that simulate the web-navigation process. In this paper we propose a new cognitive model – CoLiDeS++Pic (based on Comprehension-based Linked model of Deliberate Search or CoLiDeS) that incorporates path adequacy and backtracking strategies. This model also takes into consideration the semantics of pictures. Firstly, we present here the results of an experiment in which we test the efficacy of support based on the new model CoLiDeS++Pic and multi-tasking under cognitively demanding situations. The results prove that the model-generated support is effective. Secondly, we also propose that in this way navigation behavior can be better modeled when compared to previous models. We verify this hypothesis by simulating the model on a mock-up website and comparing the results with a previous model CoLiDeS+. Extending our previous work we demonstrate that the performance of the new model CoLiDeS++Pic is improved compared to the preceding model CoLiDeS+. We further discuss the challenges and advantages of automating navigation support using the proposed model.
- Information scent
- Navigation support
- Cognitive models
In today’s world, any information we seek can be searched and possibly found on the internet. In fact the amount of information on the internet is so abundant that users are known to often face what is called infobesity or information overload. It is therefore of great importance to be able to sift and navigate through millions of pages by discarding the irrelevant ones and focusing only on the relevant ones to quickly find what we are looking for. However, this is cognitively challenging for most users and research has shown that users often get lost and disoriented in this process. Here cognitive models come into the picture: they can simulate user’s navigation through web pages, can provide support by identifying relevant pages and can rectify usability problems such as poor navigation architecture of a website [1, 2]. These models take into account all the cognitive processes underlying information seeking behavior: perception, comprehension, reasoning, decision making and problem solving. The first aim of this article is to describe our own modeling efforts of web-navigation. Several models exist, some of which we first review in the next section. After that we will describe our own modeling based on CoLiDeS or Comprehension-based Linked Model of Deliberate Search developed by Kitajima et al. . The second aim of this article is to empirically investigate the usefulness of automated model-generated support using the cognitive model. This article mainly differs from our related proceedings paper  through emphasizing the modeling part and comparing the performance of different versions of the same model, i.e. a comparison of the CoLiDeS+ and CoLiDeS++Pic model.
Cognitive models of web-navigation
Before getting into details of models of human navigation behavior with computers, we first briefly look at two theories on which most of them are based. We first look at the Construction-Integration Theory of text comprehension proposed by . When we read a piece of text, several other concepts not mentioned in the text and their vivid memories appear in our mind, in working memory. Construction-Integration Theory attempts to account for these cognitive processes when reading and comprehending a piece of text. As the name suggests, it consists of two phases: knowledge construction phase and knowledge integration phase. During construction phase, instructions in the form of text are encoded and elaborated with associated or closely related and alternative meanings. Knowledge to decide between the alternatives is also inferred and generated. During the integration phase, one representation from the many alternatives and activated concepts is determined and stored in memory. Just like in text comprehension, during the process of web-navigation as well, a user has to comprehend and understand not only the hyperlink texts (link labels) visible on the current page, but also to integrate and relate these to the hyperlinks chosen during the session before. Thus, the construction and integration cycles are highly relevant to the process of web-navigation.
The second theory is called Information Foraging Theory (IFT) proposed by , which tries to answer questions such as which hyperlink to choose, how much time to spend on a particular page and on what basis these decisions are made. This approach is motivated by a theory called optimal foraging theory (OFT) which explains the foraging behavior exhibited by animals when looking for food. It is known that animals follow their sense of smell to find their way searching for food. IFT postulates that human beings behave exactly the same way when they navigate on the web. Analogous to smell in OFT, IFT introduced the concept of information scent which is the (imperfect) estimate of the value or cost of information sources represented by proximal cues (such as hyperlinks and icons). At any point of time, users would assess the net information gain they would get by accessing particular information compared to the cost of processing that information and follow that path that maximizes its information scent. We are now ready to describe a few cognitive models of web-navigation.
Linked model of comprehension-based action planning and instruction taking (LICAI)
Kitajima and Polson introduced a model called Linked Model of Comprehension-based Action Planning and Instruction Taking (LICAI) that simulates learning by exploration [5, 6]. It is based on Construction-Integration theory of text comprehension, mentioned above, proposed by Kintsch . LICAI takes the example of an expert Mac user working with a graphical task on an Excel application to simulate user interactions. LICAI also defines the cognitive processes involved in the generation of goals from a set of instructions by proposing several modified versions of construction-integration cycles.
Method for evaluating site architectures (MESA)
Miller and Remington proposed a Method for Evaluating Site Architectures (MESA) . This model focuses on the quality of link labels and the effectiveness of various link selection strategies. By varying the link quality and using links that are not fully descriptive of the target goals, user behavior is modeled. The situation when the user is not sure of his/her goal or is not knowledgeable enough to assess the relevance of the link texts to the goals is modeled. It uses three main cognitive principles: limit capacity principle, that is, human memory has limited capacity and therefore the model focuses on only one link at a time, simplicity principle, that is, the model favors simple approximations to complex features that add little value and rationality principle, that is, the model assumes that users are rational and they always choose the best strategy. The model however does not give an account of how the link relevancies are assessed, but instead focuses on the effectiveness of selecting various links given their relevance to the search goal. Also the model assumes that the structure of the website is known beforehand.
Scent-based navigation and information foraging in ACT architecture (SNIF-ACT)
SNIF-ACT (Scent-based Navigation and Information Foraging in ACT Architecture) was developed by Pirolli and Fu to predict navigational choices and simulate user behavior as they perform unfamiliar information retrieval tasks on the web . Actions such as which hyperlink to click, where to go next, when to leave the website are decided based on the measure of information scent. SNIF-ACT 1.0 assumed that users assess all the hyperlinks on a web-page before making a choice. However, several studies showed that user choices are sensitive to the location of hyperlinks on the web-page. SNIF-ACT 2.0 was later introduced by Fu and Pirolli  incorporating mechanisms from Bayesian Satisficing Model . It combines the measure of information scent, the position of hyperlinks on a search result page and the number of hyperlinks evaluated so far into a satisficing process that determines whether to continue to evaluate more hyperlinks or to click on the best hyperlink found so far.
Comprehension-based linked model of deliberate search (CoLiDeS)
For the specific goal that we took as an example, the user has to first select “Circulatory System” and then “Lymphatic System”. This process is repeated for every new page until the user reaches the target destination. The CoLiDeS model uses Latent Semantic Analysis (LSA) introduced by Landauer et al., to determine information scent between the user goal and the content of hyperlinks on a given web page . The information scent or semantic similarity between the goal and the hyperlink text is based on the overlap in meaning between both . Semantic similarity is computed with Latent Semantic Analysis technique. LSA is an unsupervised machine learning technique that builds a high dimensional semantic space using a large corpus of documents that represents a given user population’s knowledge and understanding of words. The meaning of a word or sentence is represented as a vector in that high dimensional space. The degree of similarity between a link and the goal of the reader is measured by the cosine value (correlation) between corresponding vectors [2, 12]. Each cosine value lies between +1 and −1. Closer the value to +1, higher is the similarity between two words. Values near zero represent two unrelated texts. The relatedness between words as determined by LSA is not simply based on literal similarity but rather on deeper semantic similarity. One main advantage of LSA is that the process of determining information scent can be automatized.
The CoLiDeS model has been successful in simulating and predicting user link selections, though the websites and web pages used were very restricted . The model has also been successfully applied to finding usability problems, by predicting links that would be unclear to users [1, 2]. Note that all the four models discussed so far, LICAI, MESA, SNIF-ACT and its variants and CoLiDeS do not include any information from pictures when modeling navigation behavior. We will next describe some of the recent work addressing this limitation.
Related work: CoLiDeS + Pic
It is important to note that CoLiDeS relies only on textual information from hyperlinks. Since pictures are an essential component of almost all websites it would be useful to extend the model so that it also takes into consideration semantic information from pictures. This is done in the CoLiDeS + Pic model, using the basic CoLiDeS architecture. A central assumption in this model is that the processing of pictures happens at the initial stage of processing a web page. Semantic information from pictures can be readily available and in this way influence the link selection process (positively or negatively depending on the relevance of the pictures). In the example goal above, the model assumes that semantic features from the body picture are available for the user already at the first stages of processing and used during estimating the LSA of the most appropriate hyperlink. It is important to note here that the semantic features for a specific picture are obtained in a pre-phase of the research by a semantic feature generation task. In this task participants (non-expert users: university students) generate semantic features based on their judgment of the picture (in context) and then the features are selected, which are common between participants. For a detailed description of the procedure for obtaining the semantic information from pictures, as embedded in CoLiDeS + Pic modeling, we ask the readers to check [14, 15]. We will describe briefly previous work focused on getting empirical support in different ways for the CoLiDeS + Pic model, because this work will be the basis for the next model and the following empirical study and comparison of models.
The moment of processing pictures on a web page
First, we examined empirically the moment of processing of the pictures, testing the assumption of the CoLiDeS + Pic model that pictures are processed in the initial stages of navigation through a webpage . In an eye-tracking experiment we registrated the eye fixation durations of participants (mainly technology students) on relevant and irrelevant pictures that were included on the pages of the presented website. The website contained biological information and the pictures were either highly or lowly relevant to the content of a page. We found that pictures were processed mainly in the first 10 % of the total time spent on a web-page during the first visit of participants on that page. These results confirm the assumption of CoLiDeS + Pic that pictures are particularly processed in the initial stages of processing a web-page.
Efficacy of the CoLiDeS + Pic model
Second, in a simulation study we analyzed the behavior of the model when high relevant, low relevant or no pictures, respectively were presented in the context of search goals. In a pre-phase, semantic features from the pictures were collected and used for computing the LSA values between search goals and hyperlinks. We found that CoLiDeS + Pic with high relevant pictures increases the values of information scent of task-relevant hyperlinks, and therefore it increases the probability of selecting those hyperlinks compared to CoLiDeS without pictures or CoLiDeS + Pic with low relevant pictures. Furthermore, the results showed that CoLiDeS + Pic with high relevant pictures chooses the hyperlinks on the shortest path to the search goals more often, and also the shortest path is found more frequently by the model. An important next question is how correct are the predictions made by CoLiDeS + Pic compared to the behavior of actual readers. This question was investigated in the next validation study.
Validation of CoLiDeS + Pic model with behavioral data
Third, in a behavioral study we varied the relevance of pictures on web pages and studied the impact of varying the relevance on the navigation pattern of real participants and compared that with the behavior of the model, that is, the links the model did choose. Most importantly, in the high relevant picture condition, CoLiDeS + Pic predicted significantly more actual user clicks. This proves the second assumption made by CoLiDeS + Pic that relevance of pictures can influence the link selection process positively or negatively depending on the relevance of pictures.
Usefulness of automatic model-generated support
Fourth, in a final experiment we used the CoLiDeS + Pic model to automatically provide navigation support . The navigation support offered was based on simulation of successful paths, that is, the links chosen by the model and leading to the requested information were subsequently emphasized to the reader by highlighting the links in a contrasting green color. Compared to a control condition (without support), model-generated support had a very positive influence on navigation and search performance: participants were significantly faster and more accurate in answering questions and were less disoriented.
Summarizing the main results of our work on CoLiDeS + Pic, incorporating semantic information from high relevant pictures improves the performance of the CoLiDeS model. Also when we compared the model-predicted clicks with actual user-clicks we found that CoLiDeS + Pic with high relevant pictures predict user behavior better. Furthermore, we found that the model-generated support was helpful to improve the performance of users in terms of accuracy, disorientation, and the total time needed to perform the search tasks.
Implementation of a new model: CoLiDeS++Pic
The new cognitive model CoLiDeS++Pic is derived from CoLiDeS + Pic, but as indicated we added the concept of path adequacy and included the strategy of backtracking. We termed this combination as CoLiDeS++Pic. The new model CoLiDeS++Pic also uses the semantic information from pictures, just like CoLiDeS + Pic. We were interested in testing the impact of including semantic information from pictures in computation of path adequacy and inclusion of backtracking on modeling user navigation behavior. To test this, we ran both CoLiDeS + Pic and CoLiDeS++Pic on a mock-up website and used their predictions to generate support. The results of the simulations will be described after we have introduced the experiment on model-generated support.
Current experiment on model-generated support
Compared to the control condition (without model-generated support), we expect the support condition (with model-generated support) to have a positive influence on navigation and search performance. We hypothesize participants to be significantly faster, more accurate in answering questions, and less disoriented in navigation behavior in the support condition.
In order to examine our hypothesis regarding the influence of the variable (no-)support we performed the following experiment in which participants received support (or no support). Furthermore we introduced a second variable, multi-tasking, because we assume that model-generated support can be particularly helpful when the context demands multi-tasking . More specifically, we hypothesize that when the user is provided with support, he can perform the navigation and information search task better and faster, particularly when doing multi-tasking compared to single-tasking. In the case of multi-tasking one could hypothesize that due to restricted cognitive capacity of users, offering navigation support would be more helpful compared to the situation that no extreme cognitive load is present [21, 22]. In our experiment, while users were working with the information retrieval tasks, they had also to monitor a comedy video in parallel. By introducing a secondary task during navigation, we assume that cognitive load will be higher, participants will be distracted and performance on their main task (navigation and search) will be hindered.
Design and subjects
We followed a 2 (support vs no support) x 2 (multi-tasking vs no multi-tasking) factorial design, where the two factors were between-subject variables. Forty students of International Institute of Information Technology-Hyderabad, 34 males, 6 females (age M 27.14, SD = 6.75) participated in the experiment on a voluntary basis. The participants were randomly assigned to the four groups: Group NS-NMT (no support, no multi-tasking), Group NS-MT (no support, multi-tasking), Group S-NMT (support, no multi-tasking) and Group S-MT (support, multi-tasking). Each group had ten participants.
In order to conduct the experiment, we took the same mockup website as in  due to the availability of semantic features for pictures present in the website. Figure 3 presents a screenshot of one of the pages in this website. On all pages the navigation menu was presented on the left. The website was hierarchically organized, four levels deep, containing in total 34 pages. We created two versions of the website. In the first version, hints for the links to be selected were not given, while in the second version, there were green-colored arrows pointing to the link where users can find the answer for the given task. This support was automatically obtained by running the navigation support tool at the back-end. Figure 3 shows the version of the mockup website with the green arrow. Thus, group NS-NMT and group NS-MT were given the website without link suggestions, while group S-NMT and group S-MT were given the same website with link suggestions. There were in total eight search questions for which the participants were supposed to find the answers. These questions were equally divided into four levels based on the number of web pages to be browsed.
Information retrieval tasks (Human body website)
The muscles of the esophagus contract in waves to move the food down into the stomach. What name is given to these contractions?
In the respiratory system, what name is given to the valve that drops down when we swallow in order to protect our lungs and trachea?
Which center in the brain controls the automatic process of breathing?
Name the three layers of tissue that form the heart wall.
Name at least three chemicals that aid in transmission of information from one neuron to the other in our nervous system.
If a blood sample contains A-antigens and anti-B antibodies, what name is given to this according to ABO system?
Lymphatic System contains immune cells called lymphocytes, which protect our body from antigens. They are produced by lymph nodes. Name at least three locations in the body where lymph nodes are present.
What specific name is given to those motor neurons that act on the muscles of the face and the neck?
We measured the performance of the participants in terms of accuracy, disorientation and task-completion time.
Accuracy was assigned 1 or 0 score, if the participant answered the specific question correctly or not. It was assigned as 0.5 if the participant reached to the correct page at the end but his answer was not correct. Mean accuracy over all eight tasks was computed (score range 0–1).
R is the minimum number of pages needed to visit in order to finish the task,
S is the actual number of pages visited,
N is the number of distinct pages visited and
L is the disorientation. A higher value of L means less goal-directed navigation behavior with many detours.
Task-completion Time was the time taken by participants to complete each task. It is based on the interval between presenting the question and submitting the answer.
Participants in groups S-NMT and S-MT were instructed that the link suggestions were only an advice, and that they were free to ignore the advice and click on a hyperlink of their choice. Participants of groups NS-NMT and NS-MT were asked to perform the search tasks of finding answers to questions with no secondary task in parallel. The other two groups were asked to perform a secondary task (monitoring a comedy video) while they were completing the main tasks. These participants were informed that at the end of the session they would be asked questions about the video. At the end, participants were asked to name the characters present in that video. This was done to ensure that participants would pay attention to the video also, thus really doing multi-tasking.
We did a 2X2 between subjects ANOVA with support and multi-tasking as independent variables and disorientation as dependent variable. The main effect of support on disorientation was highly significant, F (1, 36) = 18.99, p < .01). The main effect of multi-tasking was also significant F (1, 36) = 5.35, p < .05. However the interaction of support and multi-tasking was not significant (p > .05).
The main effect of support was significant F (1, 36) = 16.54, p < .001. Participants were significantly faster in completing tasks in the support condition compared to the no support condition. The main effect of multi-tasking was not significant (p > .05). Irrespective of whether they were multi-tasking or not, there was no significant difference in task-completion times of participants. The interaction of support and multi-tasking was also not significant (p > .05). The impact of support was not significantly greater under multitasking condition.
Summarizing, we found a significant impact of providing support with respect to all our three metrics. Participants in the support condition were significantly more accurate, less disoriented and faster compared to those participants without support. We did not find any significant effects of multi-tasking. We did not find that support is particularly helpful for participants who were multi-tasking. Since all our participants were technology students who were very used to the internet and spend considerable amount of time on the computer in a day, we think this manipulation did not have any significant influence on their performance. However, we did find one counter-intuitive effect on disorientation. We found that participants were significantly less disoriented when asked to multi-task.
Comparing model performance of CoLiDeS + Pic and CoLiDeS++Pic
In this section we return to the first aim of this article, which in particularly extends our previous conference publication (at WIMS14, ): to investigate whether taking into account path adequacy and backtracking strategies next to the semantics of pictures lead to better model performance. For that purpose we will compare and contrast the two models CoLiDeS + Pic and CoLiDeS++Pic. Does inclusion of information from past selections and backtracking have any impact on the model’s performance?
First we present here an example of the implementation applied on the mock-up website we used in the experiment. The user goal is, for instance, “Lymphatic System contains immune cells called lymphocytes, which protect our body from antigens. They are produced by lymph nodes. Name at least three locations in the body where lymph nodes are present”. The correct links are Home: Introduction > Circulatory System > Lymphatic System.
LSA values for the example
Overall (mean) performance of CoLiDeS++ Pic and CoLiDeS + Pic in terms of LSA value
CoLiDeS + Pic
We can see from Table 3 that the overall mean efficacy of CoLiDeS++Pic is higher in terms of LSA values when compared to CoLiDeS + Pic (t(df = 7) = 2.59, p < .05). The CoLiDeS++Pic model works better in terms of LSA value when compared to CoLiDeS + Pic. The differences in the LSA values of both the tools were mainly observed when the path adequacy comes into consideration, which is particularly the case at deeper levels.
Effects of support on user behavior
Mean behavioral results in Experiment 1 and 2
Task-completion time (seconds)
We make two observations on Table 4. First, we already have mentioned that also in previous study (Experiment 1) which used CoLiDeS + Pic, participants with support were significantly more accurate in solving the tasks, took less clicks and were less disoriented. Second, also in the current experiment (Experiment 2) model-generated support had a positive - though weak - effect on accuracy (t(df = 18) = 1.34, p < .10 one-sided), a strong positive effect on disorientation (t(df = 18) = 3.62, p < .01) and a positive effect on time to solve the tasks (t(df = 18) = 2.85, p < .01). These results mean that, just like in the previous study which used CoLiDeS + Pic, in this experiment also, participants in the support condition were significantly faster, more accurate and less disoriented.
We presented here a new cognitive model CoLiDeS++Pic. The model is derived from two models CoLiDeS+ and CoLiDeS + Pic, taking into consideration the advantages of both [15, 19]. Based on this model we also introduced and tested a support tool for navigation. Given a specific goal, the tool provides navigation hints to the user. It uses semantic similarity between the user goal and the website hyperlinks, and so does not require any past experience or navigation history for providing hints. Furthermore it uses the navigation path, a backtracking mechanism and semantic information available from pictures. When we compared the performance of the new model with the CoLiDeS + Pic model we observed that the performance in terms of LSA value is improved (Table 3). It is capable to select the correct hyperlinks with higher information scent (higher LSA value; with higher confidence so to say. Regarding our first aim we can conclude that when backtracking, navigation path and semantics from pictures is included in the computational cognitive model, the modeling is enhanced. In subsequent analysis of the data we still have to compare the different cognitive models (CoLiDeS+, CoLiDeS + Pic and CoLiDeS++Pic) for their predictability of actual user behavior; we will do that by examining the match of the behaviors of respective models with user navigation patterns [see  for the specific method to do that]. These outcomes are needed to decide which model provides the highest predictability of user navigation behavior and thereby also decide which enhancement (backtracking via CoLiDeS+, pictures via CoLiDeS + Pic and both backtracking and pictures via CoLiDeS++Pic), provides how much improvement.
One of the main reasons of development of the modeling is of course to be able to provide more adequate support during navigation, resulting in better information seeking performance of participants. Summarizing the main results of the current experiment regarding user performance, we found that the model-generated support was helpful to improve the performance of users in terms of accuracy, disorientation, and total time needed to perform the search task (Table 4). Regarding the second aim of this article we can thus conclude that automatic model-generated support using a cognitive model can be useful for participants. Multi-tasking had no negative effects, and on disorientation even a positive effect. Apparently we were not successful in bringing about a secondary task that was taxing working memory. Even in the no-support conditions the differences in accuracy or total time needed were minimal between the multi and no multi-tasking conditions. Regarding disorientation we even did find a positive effect of multi-tasking. This effect is in line with a study reported in , where it is suggested that interruption is not always as deleterious to productivity as one might expect - although it creates more stress (which we did not measure). We interpret this pattern as that these groups might have had a higher motivation (already from the beginning or due to the instruction) for doing their search tasks. In subsequent studies a stricter and more taxing secondary task has to be used.
At present, the tool is automated except for the module of semantic features extraction from pictures, as it involves the manual task for semantic feature generation. The semantic aspects can be incorporated using the metadata and keywords for pictures when they are available. Unfortunately, extracting meaning from pictures is not yet sophisticated enough to do this automatically. State of the art systems are beginning to extract only low-level perceptual features such as color, shape, orientation and are not sophisticated enough yet to extract higher semantics. However, we demonstrated in this study that even using non-expert participants, semantic aspects from pictures can be incorporated into the modeling and that it is possible and useful to do so. For the time being the system can be used without picture information, and with the materials we used, the model and tool are functioning adequately as we have shown in our experiments.
Of course the system is preliminary and open for extensions, such as studying the model with web sites containing more than one picture on a page. It is significant to note here that we also tested our tool (not reported here) with few real-time websites (while not considering the semantics of pictures), where it worked well and provided useful and usable suggestions to the user. We used here a small website for evaluating the tool and in all cases (all questions) the answer to the question was found by the model. This triggers the questions what happens when a set of related websites is used, and also when the model fails, in the sense that no solution to the search goal is found, what information should be given to the user. One could think in this case of suggesting several alternatives consisting of the best links (more than one). Another possibility is to present two suggestions when information scent values are closely together. Several options are possible and need to be examined empirically. Another issue for further research concerns the situation that the system proposes wrong links that mislead the user. Quite another interesting research area involves the specificity of goals (given to the user or formulated by the user him/herself). Goals (or tasks) can be too general or too specific given the information available in the website(s) . The efficacy of the performance of the model will be dependent on the appropriateness of the goal. This is as it should be: when the model (or user) is asking a too general or too specific question its behavior deteriorates or slows down. The support that can be given is equally dependent on posing the right goal level or asking the right question so to say. We are working this moment on the issue of using real time websites and testing the model in this environment. Here we will also pay attention to the respective contribution of the different features (navigation path, backtracking strategy and picture information). The issues mentioned will be tackled in subsequent research.
The tool can be helpful to a wide variety of internet users. The experiment reported here shows that when the users are provided with the tool suggestions (by the green arrows), their performance in terms of accuracy, (dis)orientation and time needed to perform the search tasks is improved. We also assume that visually impaired people when augmented with text-to-speech facility or people having memory problems and new internet users can benefit by the tool too. In the future, we plan to validate the tool support for these use cases. We plan to study the system with older aged readers because we assume that particularly for readers with constrained cognitive abilities - like problems with working memory capacity - navigation support could be helpful. Finally, we want to include the possibility that readers themselves indicate and formulate their own goal - instead of the externally given goals as it is right now. We will address these questions in our further studies. Overall, we claim that making use of a cognitive model for navigation support is a useful and promising research area.
We would like to thank Saraschandra Karanam for his critical input and efforts in improving this article. This research is funded by the Netherlands Organization for Scientific Research (project MISSION 464-13-043).
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