Published on in Vol 7, No 7 (2018): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9379, first published
.
1 Department of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway
2 Department of Computer Science, Norwegian University of Science and Technology, Trondheim, Norway