1. HIV Center for Clinical and Behavioral Studies, New York State Psychiatric Institute and Columbia University, New York, NY, USA
2. School of Nursing, University of Pennsylvania, Philadelphia, PA, USA
3. Center for AIDS Prevention Studies, Department of Medicine, University of California San Francisco, San Francisco, CA, USA
4. Department of Biostatistics, University of Washington, Seattle, WA, USA
5. Division of AIDS, National Institute of Allergy and Infectious Diseases, Rockville, MD, USA
6. Asociación Civil Impacta Salud y Educación, Lima, Peru
7. Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA