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T. Yasuda
Dep. of Ob. & Gy., School of Med. Hokkaido Univ.
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N. Shinkai
Dep. of Ob. & Gy., School of Med. Hokkaido Univ.
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H. Yamada
Dep. of Ob. & Gy., School of Med. Hokkaido Univ.
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T. Fujino
Dep. of Ob. & Gy., School of Med. Hokkaido Univ.
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N. Wake
Dep. of Ob. & Gy., School of Med. Hokkaido Univ.
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S. Fujimoto
Dep. of Ob. & Gy., School of Med. Hokkaido Univ.
