1. Department of Interdisciplinary Health Sciences, Clinical Epidemiology, Faculty of Health Sciences, Stellenbosch University, Cape Town, South Africa
2. Brewelskloof Hospital, Worcester, South Africa
3. Centre for Molecular and Cellular Biology, Stellenbosch University and the South African Medical Research Council, Cape Town, South Africa
4. Massachusetts General Hospital, Boston, Massachusetts, USA
5. Biostatistics Unit, South African Medical Research Council, Cape Town, South Africa
6. National Health Laboratory Services, Cape Town, South Africa
7. Department of Paediatrics and Child Health, Faculty of Health Sciences, Stellenbosch University, South Africa; Desmond Tutu TB Centre, Faculty of Health Sciences, Stellenbosch University, South Africa
8. Department of Medicine and Centre for Infectious Diseases, Faculty of Health Sciences, Stellenbosch University, South Africa; Departments of Epidemiology and International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA