Affiliation: | 1. Department of Obstetrics and Gynecology, Inova Health System, Falls Church, Virginia, USA;2. Women's Health of Central Virginia, Lynchburg, Virginia, USA;3. Department of Obstetrics and Gynecology, Johns Hopkins All Children's Maternal, Fetal & Neonatal Institute, Tampa, Florida, USA;4. Children's National Health System, Prenatal Pediatric Institute, Washington, District of Columbia, USA |