1. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania;
2. Division of Gastroenterology and Hepatology, Sidney Kimmel Medical College, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania;
3. Department of Obstetrics and Gynecology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania