Published on in Vol 6, No 11 (2018): November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12237, first published
.
1 ITACA, Universitat Politècnica de València, Valencia, Spain
2 Department of Computer Science, University of Tromsø, Tromsø, Norway
*all authors contributed equally