1. Division of Epidemiology & Biostatistics, School of Public Health, University of Cape Town , Cape Town , South Africa
2. Department of Medicine, Johns Hopkins University , Baltimore, Maryland , USA
3. Division of Intramural Research, NIAID, NIH , Baltimore, Maryland , USA
4. Rakai Health Sciences Program , Entebbe , Uganda
5. Division of Medical Virology, University of Cape Town and National Health Laboratory Service , Cape Town , South Africa
6. Division of Clinical Pharmacology, Department of Medicine, University of Cape Town , Cape Town , South Africa
7. ICAP at Columbia University, Mailman School of Public Health, and Department of Paediatrics, Vagelos College of Physicians & Surgeons, Columbia University , New York, New York , USA
8. Institute of Infectious Disease and Molecular Medicine, University of Cape Town , Cape Town , South Africa