○Takehiro Hiraoka1,2, Osamu Yoshino1, Yukiko Ogino1, Motohiro Nakamura1, Kento Onishi1, Junichi Nishijima1, Masako Honda1, Shunsuke Iwahata1, Haruko Iwase1, Nobuya Unno1
(1.Department of Obstetrics and Gynecology, Kitasato University Hospital, Kanagawa, 2.Department of Obstetrics and Gynecology, The University of Tokyo Hospital, Japan)
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