1. Global Health and Infection Department, Brighton and Sussex Medical School, Brighton, United Kingdom
2. Clinical Research Department, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. Department of Internal Medicine, Edendale Hospital, University of KwaZulu-Natal, Pietermaritzburg, South Africa
4. Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom
5. School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
6. Malawi-Liverpool Wellcome Trust Clinical Research Programme, Blantyre, Malawi
7. Institute for Global Health, University College London, London, United Kingdom