Affiliation: | (1) Department of Obstetrics and Gynecology, Fujita Health University School of Medicine, Toyoake, 470-1192 Aichi, Japan;(2) Department of Obstetrics and Gynecology, National Saitama Hospital, Saitama, Japan;(3) Department of Obstetrics and Gynecology, Tokai University School of Medicine, Kanagawa, Japan |