Affiliation: | 1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill, Chapel Hill, NC 2 Department of Obstetrics, Leiden University Medical Centre, Leiden, the Netherlands 3 Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX 4 Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Maryland School of Medicine, Baltimore, MD 5 Department of Obstetrics and Gynecology, University of Kansas School of Medicine, Kansas City, KS. |