[1] Univ Cape Town, Sch Publ Hlth & Family Med, CIDER, ZA-7925 Cape Town, South Africa
[2] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[3] Univ Witwatersrand, Fac Hlth Sci, Sch Clin Med, Dept Internal Med,Hlth Econ & Epidemiol Res Off, Johannesburg, South Africa
[4] Med Sans Frontieres, Khayelitsha ART Programme, Cape Town, South Africa
[5] Univ Stellenbosch, Dept Med, Div Infect Dis, Cape Town, South Africa
[6] Tygerberg Hosp, Cape Town, South Africa
[7] Aurum Inst, Johannesburg, South Africa
[8] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[9] Swiss Trop & Publ Hlth Inst, Basel, Switzerland
[10] Univ Basel, Basel, Switzerland