Published on in Vol 7, No 4 (2018): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9414, first published
.

1 Center for Sexuality & Health Disparities , University of Michigan, Ann Arbor, MI, US
2 Addiction Center, Department of Psychiatry, University of Michigan, Ann Arbor, MI, US
3 School of Public Health , University of Miami, Miami, FL, US
4 Program on Sexuality, Technology & Action Research, School of Nursing, University of Pennsylvania, Philadelphia, PA, US