1 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Alpert Medical School at Brown University, Providence, Rhode Island.
2 Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Case Western Reserve University, Cleveland, Ohio.
3 Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, University of Illinois at Chicago, Chicago, Illinois.