1. Department of Obstetrics and Gynecology, Morehouse School of Medicine, Atlanta, Georgia 30310
2. Reproductive Science Research Center, Morehouse School of Medicine, Atlanta, Georgia 30310
3. Division of Biomedical Sciences, University of California-Riverside School of Medicine, Riverside, California 92521
4. Department of Physiology, Morehouse School of Medicine, Atlanta, Georgia 30310