1. Africa Health Research Institute, KwaZulu-Natal, South Africa
2. London School of Hygiene and Tropical Medicine, London, UK
3. Malawi Epidemiology & Intervention Research Unit, Karonga, Malawi
4. Ifakara Health Institute, Dar es Salaam, Tanzania
5. Department of HIV and AIDS, Ministry of Health, Lilongwe, Malawi
6. University of KwaZulu-Natal, Durban, South Africa