^○Kenta Sui, Takehiro Okabayashi, Tatsuaki Sumiyoshi (Department of Surgery, Kochi Health Sciences Center)

^○Kentaro Kadono, Yoichiro Uchida, Akinori Miki, Ryo Ohio, Tomohiro Okamoto, Ryo Kamimura, Masashi Horiguchi, Hiroaki Terajima (Department of Surgery, Kitano Hospital, Osaka, Japan)

^○Hisanobu Higashi, Yuta Abe, Gou Oshima, Kiminori Takano, Hiroshi Yagi, Minoru Kitago, Masahiro Shinoda, Yuko Kitagawa (Department of Surgery, Keio University, Tokyo, Japan)

^○Kenta Furukawa, Manabu Mikamori, Hiroki Akamatsu, Masahiro Tanemura (Department of Surgery, Osaka Police Hospital)

^○Ryo Kamimura, Akimori Miki, Ryo Ohno, Kentaro Kadono, Tomohiro Okamoto, Masahumi Horiguchi, Yoichiro Uchida, Hiroaki Terajima (Division of Gastroenterological Surgery and Oncology, Medical Research Institute, Kitano Hospital, Osaka, Japan)

^○Takuya Kato, Masaru Inagaki, Koji Kitada, Naoyuki Tokunaga, Yosuke Tsunemitsu, Hiromi Iwagaki (Department of Surgery, Fukuyama Medical Center, Fukuyama, Japan)