[1] Ctr Infect Dis Res Zambia, Lusaka, Zambia
[2] Univ N Carolina, Chapel Hill, NC USA
[3] Ctr Dis Control & Prevent, Global AIDS Program, Atlanta, GA USA
[4] Off Global AIDS Coordinator, Washington, DC USA
[5] UNICEF, Johannesburg, South Africa
[6] Univ Bordeaux Segalen, INSERM, U897, Bordeaux, France
[7] Programme PAC CI, Abidjan, Cote Ivoire
[8] Univ Zimbabwe, Harare, Zimbabwe
[9] UNICEF, New York, NY USA
[10] US Agcy Int Dev, Washington, DC 20523 USA
[11] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, NIH, Rockville, MD USA