[1] Univ Cape Town, Desmond Tutu HIV Ctr, Dept Med, Cape Town, South Africa
[2] Univ Oxford, Dept Social Policy & Intervent, Oxford, England
[3] Univ Cape Town, Sch Publ Hlth, Div Epidemiol & Biostat, Cape Town, South Africa
[4] Univ Calif Los Angeles, Geffen Sch Med, Div Infect Dis, Los Angeles, CA USA
[5] Univ Cape Town, Ctr Social Sci Res, Rondebosch, South Africa
[6] Africa Hlth Res Inst, Durban, Kwazulu Natal, South Africa
[7] Univ KwaZulu Natal, Coll Hlth Sci, Sch Nursing & Publ Hlth, Durban, South Africa
[8] London Sch Hyg & Trop Med, Dept Global Hlth & Dev, London, England