1. Department of Obstetrics and Gynecology (E.A.-I., M.S., K.S., F.N., S.M., T.T., A.I., K.-i.M., T.K.), Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
2. Department ofOsaka Medical Center and Research Institute for Maternal and Child Health (M.N., Y.O., N.S.), Osaka 594-1101, Japan
3. Department of Obstetrics and Gynecology (T.Y.), Sakai Municipal Hospital, Osaka 591-0064, Japan
4. Department of Obstetrics and Gynecology/Section of Gynecologic Oncology (E.L.), University of Chicago, Chicago, Illinois 60637