1. University of Texas Southwestern Medical Center (K.J.S., B.R.C., W.E.R.), Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology, Dallas, Texas 75390-9032
2. Tohuku University School of Medicine (T.S., H.S.), Department of Pathology, Sendai, Japan 980-8574
3. King’s College London (J.P.), London, United Kingdom SE1 1UL
4. University of Pennsylvania Medical Center (C.H., J.F.S.), Center for Research on Reproduction and Women’s Health, Philadelphia, Pennsylvania 19104