Shinya Matsuzaki1, Masayuki Endo2, Tadashi Kimura2. 1. Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, Osaka, Japan. Electronic address: zacky@gyne.med.osaka-u.ac.jp. 2. Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, Osaka, Japan.