Published on in Vol 21, No 9 (2019): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15298, first published
.
1 Prevention Insights, Institute for Research on Addictive Behavior, School of Public Health, Indiana University Bloomington, Bloomington, IN, United States
2 Rural Center for AIDS/STD Prevention, School of Public Health, Indiana University Bloomington, Bloomington, IN, United States
*all authors contributed equally