Affiliation: | 1. Department of Gastroenterological Surgery, Gunma Prefectural Cancer Center, 617-1 Takabayashi-Nishi, Ota, Gunma, 373-8550, Japan 2. Department of General Surgical Science, Gunma University Faculty of Medicine, 3-39-22 Showa-machi, Maebashi, Gunma, 371-8511, Japan
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