1 Emory University School of Medicine, 100 Woodruff Circle, Atlanta, GA 30322, USA.
2 Emory Reproductive Center, Division of Reproductive Endocrinology and Infertility, Department of Gynecology and Obstetrics, Emory University School of Medicine, 550 Peachtree St. NE, Atlanta, GA 30308, USA.
3 Division of Family Planning, Department of Gynecology and Obstetrics, Emory University School of Medicine, 550 Peachtree St. NE, Atlanta, GA 30308, USA.