[1] Univ Liverpool Liverpool Sch Trop Med, Dept Int Publ Hlth, Community Hlth Syst Grp, Pembroke Pl, Liverpool L3 5QA, Merseyside, England
[2] Infect Dis Inst, Kampala, Uganda
[3] Univ Cape Town, Sch Publ Hlth & Family Med, Cape Town, South Africa
[4] Desmond Tutu HIV Ctr, Cape Town, South Africa
[5] Univ Liverpool, Inst Syst Mol & Integrat Biol, Liverpool, Merseyside, England
[6] Royal Liverpool Univ Hosp, Trop Infect Dis Unit, Prescot St, Liverpool, Merseyside, England