[1] Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, Bixby Ctr Global Reprod Hlth, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Ctr AIDS Prevent Studies, San Francisco, CA 94143 USA
[3] Infect Dis Res Collaborat, Kampala, Uganda
[4] Univ Calif San Francisco, Dept HIV Infect Dis & Global Med, San Francisco, CA 94143 USA
[5] Makerere Univ Joint AIDS Program, Kampala, Uganda
[6] Kenya Govt Med Res Ctr, Ctr Microbiol Res, Nairobi, Kenya
[7] Univ Calif Berkeley, Sch Publ Hlth, Div Biostat, Berkeley, CA 94720 USA
[8] Univ Calif Berkeley, Sch Publ Hlth, Div Epidemiol, Berkeley, CA 94720 USA
[9] Makerere Univ Coll Hlth Sci, Kampala, Uganda