1. Center for LGBT Health Research, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
2. Department of Behavioral and Community Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
3. Yale University Center for Interdisciplinary Research on AIDS, New Haven, CT, USA
4. Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
5. Department of Human Behavior, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA
6. Dental Public Health, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA