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Koichi KUBOTA
Department of Obstetrics and Gynecology, School of Medicine, Chiba University
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Tokuzo KASAI
Department of Obstetrics and Gynecology, School of Medicine, Chiba University
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Hiroyoshi TAKAMIZAWA
Department of Obstetrics and Gynecology, School of Medicine, Chiba University
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Yoshio TENJIN
Department of Gynecology, Sasaki Institute Kyoundo Hospital