Department of Obstetrics and Gynecology (C.R., M.E.A.S., F.K.L.), Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands; Department of Epidemiology (E.S.), Julius Center for Health Sciences and Primary Care, Utrecht, the Netherlands; Department of Obstetrics and Gynecology (A.K., M.A.O.), University Medical Center Utrecht, Utrecht, the Netherlands; Department of Obstetrics and Gynecology (K.W.M.B., S.A.S.), Leiden University Medical Center, Leiden, the Netherlands; Department of Obstetrics and Gynecology (A.C.B., C.J.d.G.), VU University Medical Center, Amsterdam, the Netherlands; Department of Obstetrics and Gynecology (J.C., J.J.J.D.), Erasmus Medical Center, Rotterdam, the Netherlands; Department of Obstetrics and Gynecology (J.v.E., B.N.B.), Isala Clinics, Zwolle, the Netherlands; Department of Obstetrics and Gynecology (M.T.M.F., M.G.v.P., K.M.S.), University Medical Center, Groningen, the Netherlands; Departments of Neonatology (J.H.K.), Obstetrics and Gynecology (S.M.C.V., B.W.J.M., J.A.M.v.d.P.), and Clinical Research Unit (B.C.O.), Academic Medical Center, Amsterdam, the Netherlands; Department of Obstetrics and Gynecology (A.M., M.M.P.), Maxima Medical Center, Veldhoven, the Netherlands; Department of Obstetrics and Gynecology (D.N.M.P.), Amphia Hospital, Breda, the Netherlands; and Department of Obstetrics and Gynecology (H.C.J.S., C.W.), Maastricht University Medical Center, GROW School for Oncology and Developmental Biology, Maastricht, the Netherlands