Affiliation: | 1. Department of Surgery, Gastroenterological Center, Yokohama City University, 4‐57 Urafune‐cho, Minami‐ku, Yokohama 232‐0024, Japan;2. Department of Gastroenterological Surgery, Graduate School of Medicine, Yokohama City University, 3‐9 Fukuura, Kanazawa‐ku, Yokohama 236‐0004, Japan |