Kohei Yamaguchi1, Tetsushi Tsuruga1, Yoko Matsumoto2, Haruka Nishida1, Ayumi Taguchi1, Yuichiro Miyamoto1, Kenbun Sone1, Michihiro Tanikawa1, Mayuyo Mori1, Katsutoshi Oda1, Yutaka Osuga1, Tomoyuki Fujii1
(1.The Department of Obstetrics and gynecology, The University of Tokyo, Tokyo, Japan, 2.The Department of Obstetrics and Gynecology, Bokuto Metropolitan Hospital, Tokyo, Japan)
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