1. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. Office of HIV/AIDS United States Agency for International Development, Washington, DC, USA
3. Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA
4. HIV Vaccine Research Unit, Instituto Dermatalogico y Cirugia de Piel Dr. Humberto Bogart Diaz, Santo Domingo, Dominican Republic
5. Department of Sociology, Center on Health, Risk and Society, American University, Washington, DC, USA