Published on in Vol 18, No 6 (2016): Jun
1 School of Computer Science and Communication, KTH Royal Institute of Technology, Stockholm, Sweden
2 Institute of Informatics, TH Köln - University of Applied Sciences, Gummersbach, Germany
3 Department of Information Technology, Uppsala University, Uppsala, Sweden
4 Örebro University School of Business, Örebro University, Örebro, Sweden
*all authors contributed equally