1. Bridge HIV, San Francisco Department of Public Health, San Francisco, California.
2. Center for AIDS Prevention Studies, Department of Medicine, University of California, San Francisco, California.
3. Department of Psychology, Center for Health/HIV Intervention and Prevention, Storrs, Connecticut.
4. Gladstone Institutes, University of California, San Francisco, California.
5. Investigaciones Medicas en Salud, Lima, Peru.
6. Bagatto, Inc., San Francisco, California.