1. HAN University of Applied Sciences, Center for IT and Media, Radboud University, Institute for Computing and Information Sciences, Nijmegen, The Netherlands
2. HAN University of Applied Sciences, Center for IT and Media, Arnhem, The Netherlands
3. Radboud University, Institute for Computing and Information Sciences, Nijmegen, The Netherlands
4. Johannes Kepler University of Linz, Department of Business Informatics - Communications Engineering, Linz, Austria