Published on in Vol 6 , No 2 (2019) :Jul-Dec
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12667, first published
.

1 College of Public Health and Health Professions, University of Florida, Gainesville, FL, US
2 Bouvé College of Health Sciences, Northeastern University, Boston, MA, US
*these authors contributed equally