[1] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Obstet & Gynecol, 833 Chestnut St,Suite 301, Philadelphia, PA 19107 USA
[2] Emory Univ, Sch Med, Dept Gynecol & Obstet, 550 Peachtree St,Suite 1800, Atlanta, GA 30308 USA
[3] Emory Univ, Sch Med, Div Reprod Endocrinol & Infertil, 550 Peachtree St,Suite 1800, Atlanta, GA 30308 USA
[4] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Div Maternal Fetal Med, 833 Chestnut St, Philadelphia, PA 19107 USA