1. SARA Project, Academy for Educational Development, Washington, DC
2. University of Zimbabwe, Department of Paediatrics and Child Health, Harare, Zimbabwe
3. ZVITAMBO Project, Harare, Zimbabwe
4. Formerly of the ZVITAMBO Project, Harare, Zimbabwe
5. Harare City Health Department, Harare, Zimbabwe
6. The Johns Hopkins Bloomberg School of Public Health, Department of International Health, Baltimore, MD