^○Yoshitsugu Nakanishi, Keisuke Okamura, Takahiro Tsuchikawa, Toru Nakamura, Takehiro Noji, Toshimichi Asano, Soichi Murakami, Yuma Ebihara, Yo Kurashima, Kimitaka Tanaka, Toshiaki Shichinohe, Satoshi Hirano (Department of gastroenterological Surgery II, Hokkaido University, Sapporo, Japan)

^○Yu Katayose¹, hajime Iwasashi¹, Takaaki Araki¹, Kazuhiro Takami¹, Yoshiyuki Inoue², Naohiro Sata², Chikashi Shibata¹ (1.Hepato-Biliary and Pancreatic Surgery, Tohoku Medical and Pharmaceutical University, 2.Department of Surgery, Jichi Medical University)

^○Shogo Kobayashi^1,2, Hidetoshi Eguchi¹, Hiroshi Wada², Kunihito Gotoh¹, Takehiro Noda¹, Tadafumi Asaoka¹, Daisaku Yamada¹, Yoshifumi Iwagami¹, Hidenori Takahashi², Akira Tomokuni², Hirofumi Akita², Kei Asukai², Masayuki Ohue², Masahiko Yano², Masato Sakon², Yuichiro Doki¹, Masaki Mori¹ (1.Department of Surgery, Osaka University, Suita, Japan, 2.Department of Surgery, Osaka International Cancer Institute, Osaka, Japan)

^○Norihisa Kimura, Keinosuke Ishido, Daisuke Kudo, Shingo Sakuraba, Takafumi Yachi, Kenichi Hakamada (Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan)

^○Suefumi Aosasa, Makoto Nishikawa, Takazumi Tsunenari, Toru Kato, Mayumi Hoshikawa, Takahiro Einama, Takuji Noro, Yoshiki Kajiwara, Shuichi Hiraki, Eiji Shinto, Hironori Tsujimot, Kazuo Hase, Hideki Ueno, Junji Yamamoto (Department of Surgery, National Defense Medical College)

^○Kenya Yamanaka, Osamu Inamoto, Masahumi Kogire, Toshiyuki Kitai (Department of Surgery, Kishiwada City Hospital)