1. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Rochester, Rochester, New York
2. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, INOVA Health, Fairfax, Virginia
3. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Maryland, Baltimore, Maryland
4. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, The Ohio State University, Columbus, Ohio