1. Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, The George Washington University School of Medicine and Health Sciences, Washington DC, USA
2. Division of Maternal Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, Magee-Women’s Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, USA
3. Department of Obstetrics and Gynecology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA
4. Alexandria Health, Cambridge, MA, USA
5. Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA