1. Perinatal HIV Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. South African Medical Research Council, Cape Town, South Africa
3. Fenway Health and Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
4. Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
5. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
6. DAIDS, NIAID, NIH, Washington, DC, USA
7. National Institute for Communicable Diseases of the National Health Laboratory Services, Johannesburg, South Africa
8. Duke University, Durham, North Carolina, USA
9. Novartis Vaccines, Cambridge, Massachusetts, USA
10. National Health Laboratory Service, Cape Town, South Africa