1. Department of Epidemiology and Biostatistics, University of California, San Francisco, CA 94158
2. Department of Social and Behavioral Science, School of Public Health, University of Nevada, Las Vegas, NV 89119
3. Department of Sociology, University of California, Santa Cruz, CA 95064
4. Center for AIDS Prevention Studies, University of California, San Francisco, CA 94158
5. Center of Excellence for Transgender Health, University of California, San Francisco, CA 94158
6. Institute for Social Research, University of Michigan, Ann Arbor, MI 48104