Author's Organization:Department of Obstetrics and Gynecology Osaka City University Medical School Department of Obstetrics and Gynecology Osaka City University Medical School Department of Obstetrics and Gynecology Osaka City University Medical School Department of Obstetrics and Gynecology Osaka City University Medical School Department of Obstetrics and Gynecology Osaka City University Medical School Department of Obstetrics and Gynecology Osaka City University Medical School