[1] Anova Hlth Inst, Johannesburg, South Africa
[2] Univ Cape Town, Div Infect Dis & HIV Med, Dept Med, Cape Town, South Africa
[3] UCL, Cetr Sexual Hlth & HIV Res, Fac Populat Hlth Sci, London, England
[4] Univ KwaZulu Natal, Africa Ctr Hlth & Populat Studies, Mtubatuba, KwaZulu Natal, South Africa
[5] Univ Calif Los Angeles, David Geffen Sch Med, Div Infect Dis, Program Global Hlth, Los Angeles, CA 90095 USA
[6] Univ Cape Town, Sch Publ Hlth Family Med, Cape Town, South Africa
[7] Univ Calif San Francisco, Ctr AIDS Prevent Studies, San Francisco, CA 94143 USA