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M. Takagi
Second Department of Surgery, Hokkaido University School of Medicine
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S. Ohta
Second Department of Surgery, Hokkaido University School of Medicine
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T. Hamano
Second Department of Surgery, Hokkaido University School of Medicine
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M. Tomiyama
Second Department of Surgery, Hokkaido University School of Medicine
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T. Yamada
Second Department of Surgery, Hokkaido University School of Medicine
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T. Murakami
Second Department of Surgery, Hokkaido University School of Medicine
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T. Aoki
Second Department of Surgery, Hokkaido University School of Medicine
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M. Watanabe
Second Department of Surgery, Hokkaido University School of Medicine
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S. Sugie
Second Department of Surgery, Hokkaido University School of Medicine
