[1] Queen Mary Univ London, Barts & London Sch Med & Dent, Blizard Inst, Ctr Genom & Child Hlth, London, England
[2] Kwame Nkrumah Univ Sci & Technol, Sch Med & Dent, Coll Hlth Sci, Kumasi, Ghana
[3] Lagos State Univ, Coll Med, Lagos, Nigeria
[4] Univ KwaZulu Natal, Nelson R Mandela Sch Clin Med, Paediat & Child Hlth, Durban, South Africa
[5] Lagos State Univ, Med, Ojo, Nigeria
[6] Univ Zimbabwe, Coll Hlth Sci, Harare, Zimbabwe
[7] Makerere Univ, Lung Inst, Makerere Coll Hlth Sci, Kampala, Zimbabwe
[8] Univ Zimbabwe, Hlth Sci, Harare, Zimbabwe
[9] Malawi Liverpool Wellcome MLW, Trust Clin Res Programme, Wellcome Trust, Blantyre, Malawi