^○Masanori Tsujie, Hajime Ishikawa, Kotaro Kitani, Keisuke Inoue, Shuichi Fukuda, Hironobu Manabe, Masao Yukawa, Masatoshi Inoue (Department of Gastroenterological Surgery, Kindai University Nara Hospital)

^○Yosuke Tsuruga, Sodai Sakamoto, Yuki Fujii, Hiroki Shomura, Keizo Kazui (Department of Gastroenterological Surgery, JCHO Hokkaido Hospital, Sapporo, Japan)

^○Yuta Minami, Jun Sakai, Masaki Horiuchi, Kei Ito, Keisuke Minamizawa, Keita Nakatsutsumi, Koki Goto, Shinya Yamamoto, Hirochika Makino, Shigeru Yamagishi, Akira Nakano (Department of Surgery, Fujisawa City Hospital)

^○Koichi Taniguchi, Jun Park, Sayaka Arisaka, Taketo Saito, Nobuyuki Kamimukai (Department of Surgery, Yokohama Hodogaya Central Hospital, Yokohama, Japan)

^○Michihiro Yamamoto, Masazumi Zaima, Hidekazu Yamamoto, Takefumi Yazawa, Masaki Tani (Department of Surgery, Shiga General Hospital, Shiga, Japan)

^○Takaho Okada, Masaya Oikawa, Tetsuya Kakita, Atsushi Oyama, Tomoya Abe, Takashi Tsuchiya (Department of Gastroenterological Surgery, Sendai City Medical Center, Miyagi, Japan)