1. Department of Health Policy and Management, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA.
2. Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, USA.
3. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA.
4. Department of Health Behavior and Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA.
5. Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA.
6. American Sexual Health Association, Research Triangle Park, North Carolina, USA.