Published on in Vol 7, No 3 (2019): March
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12284, first published
.
1 Mobile Health Unit, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium
2 University of Leuven, Department of Public Health and Primary Care, Leuven, Belgium
*these authors contributed equally