1. Department of Health Behavior, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA
2. Carolina Population Center, University of North Carolina, Chapel Hill, North Carolina, USA
3. Department of Public Health Education, University of North Carolina at Greensboro, Greensboro, North Carolina, USA
4. HIV Vaccine Research Unit, Instituto Dermatológico y Cirugía de Piel Dr. Huberto Bogaert Díaz, Santo Domingo, Dominican Republic
5. Department of Prevention and Community Health, Milken Institute School of Public Health, George Washington University, Washington, District of Columbia, USA