Affiliations

• ¹ Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, 622 West 168th St., PH 1220, New York, NY 10032; Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY; Mailman School of Public Health, Columbia University, New York, NY; Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY; Mailman School of Public Health, Columbia University, New York, NY; Mailman School of Public Health, Columbia University, New York, NY; Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ; Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY. Electronic address: wb2322@cumc.columbia.edu.
• ² Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, 622 West 168th St., PH 1220, New York, NY 10032; Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY; Mailman School of Public Health, Columbia University, New York, NY; Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY; Mailman School of Public Health, Columbia University, New York, NY; Mailman School of Public Health, Columbia University, New York, NY; Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ; Department of Obstetrics and Gynecology, Columbia University Vagelos College of Physicians and Surgeons, New York, NY.