^○Kyohei Ogawa¹, Ryota Higuchi¹, Takehisa Yazawa¹, Uemura Shuichiro¹, Izumo Wataru¹, Toru Furukawa² (1.Department of Surgery, Institute of Gastroenterology, Tokyo Womens Medical University Hospital, Tokyo, Japan, 2.Department of Histopathology, Tohoku University School of Medicine, Miyagi, Japan)

^○Kazuomi Suzuki, Tsunehiko Maruyama, Mitsugi Shimoda, Shuji Suzuki (Department of gastrointestinal Surgery, Tokyo Medical University Ibaraki Medical Center, Ibaraki, Japan)

^○Rei Okada, Yuichiro Otsuka, Masaru Tsuchiya, Jun Ishii, Toshio Katagiri, Tetsuya Maeda, Yoshihisa Kubota, Hironori Kaneko, Hideaki Shimada (Department of Surgery, Toho University, Tokyo, Japan)

^○Naoyuki Tokunaga, Masaru Inagaki, Koji Kitada, Yosuke Tsunemitsu, Hiromi Iwagaki (Department of Hepato-Biliary-Pancreatic Surgery, National Hospital Organization Fukuyama Medical Center)

^○Toyoo Nitta, Shuji Komori, Masahiko Kawai (Department of Surgery, Gifu Prefectural General Medical Center, Gifu, Japan)

^○Dae Joon Park, Young-Ju Rhyu, Sun-Jong Han, Young-Hoon You, Sung-Ho Choi, Dong-Wook Choi, In-Woong Han, Jin-Seok Heo (Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea)