[1] Univ Calif San Diego, Dept Med, Div Global Publ Hlth, 9500 Gilman Dr,MC 0507, La Jolla, CA 92093 USA
[2] Univ Calif Los Angeles, Fielding Sch Publ Hlth, Dept Epidemiol, Los Angeles, CA USA
[3] Univ Calif Los Angeles, Fielding Sch Publ Hlth, Dept Biostat, Los Angeles, CA USA
[4] Friends Res Inst Inc, Los Angeles, CA USA
[5] Univ Calif Los Angeles, Semel Inst Neurosci & Human Behav, Integrated Substance Abuse Programs, Los Angeles, CA USA
[6] Univ Calif Los Angeles, David Geffen Sch Med, Ctr Clin AIDS Res & Educ, Los Angeles, CA 90095 USA
[7] AIDS Project Los Angeles, Los Angeles, CA USA
[8] Calif State Univ, Dept Sociol, Carson, CA USA