[1] Family Hlth Int, Behav & Biomed Res Div, Res Triangle Pk, NC 27709 USA
[2] Family Hlth Int, Div Biostat, Res Triangle Pk, NC 27709 USA
[3] Univ Washington, Dept Biostat, Seattle, WA 98195 USA
[4] Fred Hutchinson Canc Res Ctr, SCHARP, Seattle, WA 98104 USA
[5] Univ Zimbabwe, Dept Obstet & Gynaecol, Harare, Zimbabwe
[6] Makerere Univ, Fac Med, Kampala, Uganda
[7] Makerere Univ, Dept Obstet & Gynaecol, Kampala, Uganda
[8] Univ Calif Berkeley, Sch Publ Hlth, Dept Epidemiol, Berkeley, CA 94720 USA
[9] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[10] Case Western Reserve Univ, Dept Med, Cleveland, OH 44106 USA