1. Program of Reproductive and Stem Cell Biology (A.J.W.H., Y.C.), Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA 94305–5317;
2. Department of Obstetrics and Gynecology (K.K.), St. Mariana University School of Medicine, Kawasaki, Kanagawa 216–8511, Japan;
3. Department of Reproductive Medicine & Gynecology (B.C.J.M.F.), University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands