[1] St Georges Univ London, Div Clin Sci, Res Ctr Infect & Immun, London, England
[2] Univ Cape Town, Inst Infect Dis & Mol Med, Desmond Tutu HIV Ctr, ZA-7700 Rondebosch, South Africa
[3] Univ London London Sch Hyg & Trop Med, Fac Infect & Trop Dis, Dept Clin Res, London WC1E 7HT, England
[4] Univ Cape Town, Dept Med, Div Infect Dis & HIV Med, ZA-7700 Rondebosch, South Africa
[5] Univ North Carolina Project, Lilongwe, Malawi
[6] Univ Calif San Francisco, Dept Infect Dis, San Francisco, CA 94143 USA
[7] Mbarara Univ Sci & Technol, Mbarara, Uganda
[8] Edendale Hosp, Pietermaritzburg, South Africa
[9] St Elisabeth Hosp Tilburg, Tilburg, Netherlands
[10] Radboud Univ Nijmegen Med Ctr, Nijmegen, Netherlands
[11] Mahidol Univ, Fac Trop Med, Mahidol Oxford Res Unit, Bangkok, Thailand
[12] Univ Oxford, Nuffield Dept Clin Med, Ctr Trop Med, Oxford OX1 2JD, England
[13] Univ Cape Town, Inst Infect Dis & Mol Med, ZA-7700 Rondebosch, South Africa
[14] Univ London Imperial Coll Sci Technol & Med, Dept Med, London SW7 2AZ, England
[15] Univ London London Sch Hyg & Trop Med, Fac Epidemiol & Populat Hlth, London WC1E 7HT, England