[1] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Obstet & Gynecol, Philadelphia, PA 19107 USA
[2] Nemours Childrens Hosp, Div Adolescent Med & Pediat Gynecol, Wilmington, DE USA
[3] Nemours Childrens Hosp, Ctr Healthcare Delivery Sci, Wilmington, DE USA
[4] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Pediat, Philadelphia, PA 19107 USA