1. Department of Global Health and Development, Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, United Kingdom.
2. Zambia AIDS-related Tuberculosis Project (Zambart), School of Medicine, Ridgeway Campus, University of Zambia, Lusaka, Zambia.
3. Desmond Tutu TB Centre, Department of Paediatrics and Child Health, University of Stellenbosch, Tygerberg Campus, P.O. Box 241, Cape Town, South Africa.
4. MRC/UVRI Uganda Research Unit on AIDS, P.O. Box 49, Entebbe, Uganda.