1. National Institute for Communicable Diseases, Johannesburg, South Africa.
2. Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, South Africa.
3. Department of Electrical Engineering, Pretoria University, Pretoria, South Africa.
4. Department of Immunology, University of Zimbabwe, Harase, Zimbabwe.
5. Department of Health Services, Richmond, California.
6. HIV Vaccine and Prevention Trials Unit, MRC, Durban, South Africa.
7. Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa.
8. Zambia-UAB HIV Research Project, Lusaka, Zambia.
9. Center for AIDS Research, Stanford University Medical Center, Stanford, California.
10. Johns Hopkins Research Project, Blantyre, Malawi.
11. Division of AIDS, National Institutes of Health, Washington DC.