[1] Los Angeles Cty Dept Hlth Serv, HIV Epidemiol Program, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Sch Publ Hlth, Los Angeles, CA 90024 USA
[3] Univ Calif Los Angeles, Sch Med, Los Angeles, CA USA
[4] Johns Hopkins Univ, Sch Hyg & Publ Hlth, Baltimore, MD USA
[5] New York Blood Ctr, New York, NY 10021 USA
[6] Florida Dept Hlth, Tallahassee, FL USA
[7] Natl Ctr HIV STD & TB Prevent, Div HIV AIDS Prevent Surveillance & Epidemiol, Ctr Dis Control & Prevent, Atlanta, GA USA
[8] San Francisco Dept Hlth, San Francisco, CA USA
[9] Univ Texas, SW Med Ctr, Dallas, TX USA
[10] Seattle King Cty Dept Publ Hlth, Seattle, WA USA
[11] New York City Dept Hlth, New York, NY 10013 USA