Department of Obstetrics and Gynecology, Academic Medical Center, Amsterdam (G.-J.v.B., M.A.O., C.J.B., J.A.M.v.d.P.); Department of Clinical Chemistry and Hematology, University Medical Center Utrecht, Utrecht (J.Y.V.); Department of Obstetrics and Gynecology, Máxima Medical Center, Veldhoven (F.F.W., M.M.P.); Department of Obstetrics and Gynecology, University Medical Center Utrecht, Utrecht (A.K., K.W.M.B.); Department of Obstetrics and Gynecology, University Hospital Maastricht, Maastricht (H.C.J.S., M.E.A.S.); Department of Obstetrics, Leiden University Medical Center, Leiden (M.C.H.); Department of Obstetrics and Gynecology, Erasmus Medical Center, Rotterdam (J.M.J.C., J.J.D.); Department of Obstetrics and Gynecology, Isala Clinics, Zwolle (B.W.A.N.B., J.v.E.); Department of Obstetrics and Gynecology, University Medical Center Groningen, Groningen (M.T.M.F., K.M.S.); Department of Obstetrics and Gynecology, Radboud University Nijmegen Medical Center, Nijmegen (F.P.H.A.V., M.W., A.C.B.); Clinical Epidemiology, Biostatistics and Bioinformatics (P.M.M.B.) and Clinical Research Unit (B.C.O.) Academic Medical Center, Amsterdam, the Netherlands; and Department of Obstetrics and Gynecology, The Robinson Institute, School of Pediatrics and Reproductive Health, University of Adelaide, Adelaide, Australia (B.W.J.M.)