[1] Queen Mary Univ London, Barts & London Sch Med & Dent, Womens Hlth Res Unit, London E1 2AD, England
[2] WHO, Dept Res Policy & Cooperat, CH-1211 Geneva, Switzerland
[3] WHO, UNDP UNFPA WHO World Bank Special Programme Res D, CH-1211 Geneva, Switzerland
[4] Hosp Ramon y Cajal IRYCIS, Clin Biostat Unit, Madrid, Spain
[5] CIBER Epidemiol & Salud Publ CIBERESP, Barcelona, Spain
[6] CREP, Rosario, Santa Fe, Argentina
[7] Univ Estadual Campinas, Sch Med Sci, Dept Obstet & Gynecol, Campinas, SP, Brazil
[8] Univ Philippines, Coll Med, Dept Obstet & Gynecol, Philippine Gen Hosp, Manila, Philippines
[9] Khon Kaen Univ, Fac Med, Dept Obstet & Gynecol, Khon Kaen, Thailand
[10] All India Inst Med Sci, Dept Obstet & Gynecol, New Delhi, India
[11] Univ Pretoria, MRC, Maternal & Infant Hlth Care Res Unit, ZA-0002 Pretoria, South Africa
[12] Clin Univ Kinshasa, Dept Gynecol & Obstet, Kinshasa, DEM REP CONGO
[13] Univ So Calif, Keck Sch Med, Dept Med Educ, Los Angeles, CA 90033 USA
[14] Ecole Polytech Fed Lausanne, Lausanne, Switzerland