Department of Biostatistics, Epidemiology, and Informatics (S.N.H., S.L.M., E.F.S.) and Department of Obstetrics and Gynecology (S.N.H., S.L.M., E.F.S.), Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA; Epidemiology Branch (K.L.G., J.L.M., E.H.Y.) and Biostatistics and Bioinformatics Branch (R.S.), Division of Population Health Research, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD; Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY (P.M.); Global and Community Health Department, College of Public Health, George Mason University, Fairfax, VA (A.Z.P.); Child Health Evaluative Sciences, The Hospital for Sick Children, Toronto, Ontario, Canada (S.M.G.); Division of Epidemiology, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada (S.M.G.); The Prospective Group, Fairfax, VA (Y.Q.); Global Center for Asian Women’s Health and Bia-Echo Asia Centre for Reproductive Longevity & Equality (C.Z.) and Department of Obstetrics and Gynecology (C.Z.), Yong Loo Lin School of Medicine, National University of Singapore, Singapore