1. Zimbabwe AIDS Prevention Project, University of Zimbabwe, Harare, Zimbabwe.
2. UZ-UCSF Collaborative Research Program in Women’s Health, Harare, Zimbabwe.
3. Elizabeth Glaser Pediatric AIDS Foundation, Washington, DC, USA.
4. Chitungwiza Health Department, Chitungwiza, Zimbabwe.
5. Ministry of Health and Child Welfare, Harare, Zimbabwe.
6. Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA.
7. Department of Pediatrics, Wake Forest University Health Sciences, Winston-Salem, NC, USA.