1. Perinatal HIV Research Unit (PHRU), School of Clinical Medicine, Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
2. Health Systems Research Unit South African Medical Research Council Cape Town South Africa
3. African Social Sciences Unit of Research and Evaluation (ASSURE), Division of the Wits Health Consortium University of the Witwatersrand Johannesburg South Africa
4. Ohio State University College of Medicine Columbus Ohio USA
5. Department of Emergency Medicine Loma Linda University Medical Center Loma Linda California USA
6. Wits Reproductive Health and HIV Institute (Wits RHI), Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
7. Vaccine and Infectious Disease Division Fred Hutchinson Cancer Center Seattle Washington USA