1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology; Perelman School of Medicine at the University of Pennsylvania; Philadelphia PA USA
2. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology; Sidney Kimmel Medical College of Thomas Jefferson University; Philadelphia PA USA
3. Division of Maternal-Fetal Medicine, Women's Health Service Line; Geisinger Health System; Danville PA USA
4. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology; Temple University; Philadelphia PA USA