1. Gamification Group, Tampere University, Finland and
Escola Universitària ERAM, Universitat de Girona, Spain
2. Escola Universitària ERAM, Universitat de Girona, Spain
3. Gamification Group, Faculty of Information Technology and Communications, Tampere University, Finland
4. Gamification Group, Tampere University, Finland
5. Tampere University, Finland
6. Gamification Group, Faculty of Information Technology and Communication Sciences, Tampere University, Finland