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Fumio SANO
The First Department of Surgery, University of Hokkaido, School of Medicine
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Yoichi KASAI
The First Department of Surgery, University of Hokkaido, School of Medicine
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Tetsuro KONNO
The First Department of Surgery, University of Hokkaido, School of Medicine
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Osamu NISHIDA
The First Department of Surgery, University of Hokkaido, School of Medicine