Affiliation: | 1. Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan 2. Department of Gastrointestinal Medicine, Social Insurance Kyoto Hospital, 27 Shimofusa-cho, Oyama, Kita-ku, Kyoto, 603-8151, Japan
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