Published on in Vol 21, No 6 (2019): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11934, first published
.
1 imec-mict, Department of Communication Sciences, Ghent University, Ghent, Belgium
2 imec-IDLab, Department of Information Technology, Ghent University, Ghent, Belgium
3 imec-smit, Department of Communication Sciences, Vrije Universiteit Brussel, Brussels, Belgium