1. Departments of Physiology and Pharmacology and Obstetrics and Gynecology and the Perinatal Research Laboratories, Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, North Carolina; Perinatal Research Laboratories, Bowman Gray School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157
2. Departments of Physiology and Pharmacology and Obstetrics and Gynecology and the Perinatal Research Laboratories, Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, North Carolina