Published on in Vol 8, No 10 (2020): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/19280, first published
.
1 Department of Economics and Management, Karlsruhe Institute of Technology, Karlsruhe, Germany
2 Gamification Group, Faculty of Information Technology and Communication Sciences, Tampere University, Tampere, Finland
*these authors contributed equally