1. Division of Infectious Diseases, University of California, Los Angeles, CA, USA
2. Center for Interdisciplinary Studies in Sexuality, AIDS and Society, and Laboratory of Sexual Health, Universidad Peruana Cayetano Heredia, Lima, Peru
3. Department of Infectious Disease Epidemiology, Imperial College London, UK
4. Division of Global Public Health, University of California, San Diego, CA, USA
5. Instituto Nacional de Salud, Lima, Perú