1. Division of Reproductive Biology Research (H.I., S.R., M.D., S.E.B.), Department of Obstetrics and Gynecology, Feinberg School of Medicine at Northwestern University, Chicago, IL 60611
2. Biostatistics Core Facility (A.W.R.), Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL 60611
3. Department of Obstetrics and Gynecology (T.K., M.I.), Kanazawa University Graduate School of Medicine, Takaramachi, Kanazawa-shi, Ishikawa-ken 920-8641, Japan
4. Department of Reproductive Medicine (H.U., M.S.), Graduate School of Medicine, Chiba University, Chuo-ku, Chiba-shi 260-8670, Japan