Published on in Vol 6 , No 2 (2018) :February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/7531, first published
.

1 Tomsk Polytechnic University, Tomsk, RU
2 Department of Information Engineering and Computer Science, University of Trento, Trento, IT
3 Department of Psychology, Humboldt-Universität zu Berlin, Berlin, DE
*all authors contributed equally