[1] New York State Psychiat Inst & Hosp, HIV Ctr Clin & Behav Studies, New York, NY 10032 USA
[2] Columbia Univ, New York, NY 10032 USA
[3] Univ Witwatersrand, Fac Hlth Sci Maternal Adolescent & Child Hlth Res, Dept Obstet & Gynaecol, ZA-3629 Durban, South Africa
[4] Univ KwaZulu Natal, Sch Pharm & Pharmacol, Fac Hlth Sci, ZA-3627 Durban, South Africa
[5] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY 10032 USA
[6] CUNY, Sch Publ Hlth, Hunter Coll, Epidemiol & Biostat Program, New York, NY 10035 USA
[7] Columbia Univ, Mailman Sch Publ Hlth, Dept Biostat, New York, NY 10032 USA
[8] Columbia Univ, Joseph Mailman Sch Publ Hlth, GH Sergievsky Ctr, New York, NY 10032 USA