1. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Health, Behavior and Society, Baltimore, USA
2. United States Agency for International Development, Washington, USA
3. Department of Health Behavior, Gillins School of Global Public Health, University of North Carolina, Chapel Hill, USA
4. Instituto Dermatológico y Cirugía de Piel Dr. Huberto Bogaert Díaz, HIV Vaccince Research Unit, Santo Domingo, Dominican Republic