1. UCL Interaction Centre (UCLIC), University College London, United Kingdom and Institute of Cognitive Neuroscience (ICN), University College London, United Kingdom
2. Institute of Computer Science, University of St Gallen, Switzerland and Institut für Informatik, Ludwig Maximilian University of Munich, Germany
3. Institute of Computer Science, University of St. Gallen, Switzerland and Department of Informatics, University of Oslo, Norway
4. Department of Computer Science and Engineering, Chalmers University of Technology, Sweden