N K Ayala1, M B Kole1, M Forcier2, J Halliday3, M L Russo1. 1. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Women & Infants Hospital of Rhode Island, Alpert Medical School of Brown University, UnitedStates. 2. Department of Pediatrics, Division of Adolescent Medicine, Hasbro Children's Hospital, Alpert Medical School of Brown University, UnitedStates. 3. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Women & Infants Hospital of Rhode, Island.