1. Department of Clinical Research, London School of Hygiene and Tropical Medicine, London, United Kingdom
2. Africa Health Research Institute, KwaZulu-Natal, South Africa
3. Division of Infectious Diseases, Imperial College London, London, United Kingdom
4. Africa Health Research Institute, School of Nursing and Public Health, University of KwaZulu-Natal, KwaZulu-Natal, South Africa
5. Academic Unit of Primary Care and Population Sciences
6. Department of Social Statistics and Demography, and
7. Research Department of Epidemiology and Public Health, University College London, London, United Kingdom
8. Division of Medical Microbiology and
9. Institute for Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa; and
10. National Health Laboratory Service, Groote Schuur Hospital, Cape Town, South Africa
11. Global Health Research Institute, Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, United Kingdom