1. Children’s National Health System, Prenatal Pediatric Institute, Washington, DC, USA
2. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Inova Health Systems, Falls Church, VA, USA
3. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, University of Florida College of Medicine, Gainesville, FL, USA
4. Division of Maternal Fetal Medicine, Perinatal associates of Northern Virginia, Fairfax, VA, USA