1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York
2. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Maimonides Medical Center, Brooklyn, New York
3. Division of Maternal-Fetal Medicine and Surgical Critical Care, Baylor College of Medicine, Houston, Texas