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H. Yamada
Department of Obstetrics and Gynecology, School of Medicine, Hokkaido University
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T. Koujyo
Department of Obstetrics and Gynecology, School of Medicine, Hokkaido University
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T. Sasaki
Department of Obstetrics and Gynecology, School of Medicine, Hokkaido University
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S. Fujimoto
Department of Obstetrics and Gynecology, School of Medicine, Hokkaido University
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J. A. Hill
Brigham and Women's Hospital, Harvard Medical School