[1] Muhimbili Univ Hlth & Allied Sci, Dept Microbiol & Immunol, Dar Es Salaam, Tanzania
[2] NICHD, Pediat Adolescent & Maternal AIDS Branch, NIH, DHHS, Bethesda, MD USA
[3] Fred Hutchinson Canc Res Ctr, Seattle, WA 98104 USA
[4] Univ Alabama, Sch Publ Hlth, Birmingham, AL 35294 USA
[5] Family Hlth Int, Res Triangle Pk, NC 27709 USA
[6] NIAID, Prevent Sci Program, NIH, Bethesda, MD 20892 USA
[7] Univ N Carolina, Chapel Hill, NC USA
[8] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[9] Drexel Univ, Dept Obstet & Gynaecol, Philadelphia, PA 19104 USA
[10] Harvard Univ, Sch Publ Hlth, Dept Nutr, Boston, MA 02115 USA
[11] Harvard Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA 02115 USA