Published on in Vol 5, No 4 (2019): Oct-Dec
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13593, first published
.
1 Rollins School of Public Health, Emory University, Atlanta, GA, United States
2 College of Public Health, University of Kentucky, Lexington, KY, United States
*these authors contributed equally