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