[1] Univ Zimbabwe, Biomed Res & Training Inst, Harare, Zimbabwe
[2] Univ Zimbabwe, Dept Med, Harare, Zimbabwe
[3] Univ Coll London Hosp, Dept Dermatol, London, England
[4] Univ Cambridge, Dept Pathol, Cambridge CB2 1QP, England
[5] DDL Diagnost Lab, Voorburg, Netherlands
[6] Univ Zimbabwe, Dept Paediat, Harare, Zimbabwe
[7] Kings Coll Hosp London, Dept Histopathol, London, England
[8] UCL, Div Med, London WC1E 6BT, England
[9] Univ Malawi, Malawi Liverpool Res Program, Blantyre, Malawi
[10] UCL, London Sch Hyg & Trop Med, Dept Clin Res, London WC1E 6BT, England
[11] UCL, Res Dept Infect & Populat Hlth, London WC1E 6BT, England