1. Department of Epidemiology, School of Public Health, University of Washington, Box 357236, Seattle, WA 98195, USA
2. Center for AIDS and STD, School of Public Health, University of Washington, Harborview Medical Center, 325 9th Avenue, Box 359931, Seattle, WA 98104-2499, USA
3. Facultad de Medicina de la Universidad San Martín de Porres, Avenida Alameda del Corregidor 1531, Urb. Los Sirius, Las Viñas, La Molina, Lima 12, Peru
4. Department of Global Health, School of Public Health, University of Washington, Harborview Medical Center, 325 9th Avenue, Box 359931, Seattle, WA 98104, USA
5. Department of Medicine, School of Medicine, University of Washington, Box 356420, Seattle, WA 98195, USA
6. Dirección General de Epidemiología, Ministerio de Salud del Perú, Avenda Salaverry 801, Jesús María, Lima, Peru
7. Asociación Civil Impacta Salud y Educación, Avenida Almirante Miguel Grau No. 1010, Lima, Peru