1. Departments of Physiological Sciences (G.J.P., T.J.L.) Eastern Virginia Medical School, Norfolk, Virginia 23501
2. Obstetrics and Gynecology (A.M.), Eastern Virginia Medical School, Norfolk, Virginia 23501
3. Departments of Obstetrics/Gynecology/Reproductive Sciences and Physiology (G.A., E.D.A.), University of Maryland School of Medicine, Baltimore, Maryland 21201