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Keizo Ishihara
The 1st Department of Surgery, Gunma University School of Medicine, Maebashi, Japan
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Junichi Kawafuchi
The 1st Department of Surgery, Gunma University School of Medicine, Maebashi, Japan
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Koichiro Kano
The 1st Department of Surgery, Gunma University School of Medicine, Maebashi, Japan
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Ichiro Ishizaka
The 1st Department of Surgery, Gunma University School of Medicine, Maebashi, Japan