1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Washington University School of Medicine in St. Louis, 660 South Euclid Ave., St. Louis, MO 63110; Department of Obstetrics and Gynecology, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel. Electronic address: rosenbloomj@wustl.edu.
2 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Washington University School of Medicine in St. Louis, St. Louis, MO.