1. Departments of Obstetrics and Gynecology, Physiology and Pharmacology, Wake Forest University School of Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
2. Departments of Obstetrics and Gynecology, Physiology and Pharmacology, Wake Forest University School of Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina; Department of Obstetrics and Gynecology, Wake-Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157-1066