1 Department of Anesthesiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, MetroHealth Hospital, Case Western Reserve University School of Medicine, Cleveland, Ohio, the Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Women's Health, University of Louisville, Louisville, Kentucky, and the Department of Obstetrics & Gynecology, Maternal-Fetal Medicine, Columbia University Medical Center, New York, New York.