1. Department of Epidemiology, 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 Health Policy and Management, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA.
4. Harvard T.H. Chan School of Public Health, Boston, MA, USA.
5. Department of Health Behavior, 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.
7. Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA.