1. Department of Paediatrics and Child Health; Faculty of Medicine; Desmond Tutu TB Centre; Stellenbosch University; Stellenbosch South Africa
2. Zambart, School of Medicine; Lusaka Zambia
3. Department of Clinical Research; London School of Hygiene and Tropical Medicine; London UK
4. Department of Global Health and Development; Faculty of Public Health and Policy; London School of Hygiene and Tropical Medicine; London UK
5. Department of Social and Environmental Health Research; Centre for Evaluation; London School of Hygiene and Tropical Medicine; London UK
6. Department of Sociology and Social Anthropology; Faculty of Arts and Social Sciences; Stellenbosch University; Stellenbosch South Africa
7. Population Studies and Training Center; Brown University; Providence RI USA