1. Division of Immunology, Department of Pathology, University of Cape Town, South Africa
2. Medical Research Council (MRC) International Statistics and Epidemiology Group, London School of Hygiene & Tropical Medicine
3. Department of Infectious Disease, Imperial College London, London, UK
4. Division of Molecular Biology and Human Genetics, Biomedical Research Institute, Stellenbosch University, Cape Town, South Africa
5. University of the Witwatersrand Perinatal HIV Research Unit, Johannesburg, South Africa
6. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
7. Department of Pharmacology, University of Liverpool, Liverpool, UK
8. MRC/Uganda Virus Research Institute/London School of Hygiene & Tropical Medicine Uganda Research Unit, Entebbe, Uganda
9. King's College London, London, UK.