^○Suguru Yamada¹, Wataru Izumo², Akira Kobayashi³, Shinichi Miyagawa³, Shoji Nakamori⁴, Daisuke Hashimoto⁵, Hideo Baba⁵, Shigehiro Shiozaki⁶, Yasuo Shima⁷, Shimpei Maeda⁸, Michiaki Unno⁸, Naoya Sato⁹, Akira Kenjo⁹, Seiji Natsume¹⁰, Yasuhiro Shimizu¹⁰, Masahide Hiyoshi¹¹, Atsushi Nanashima¹¹, Sohei Satoi¹², Ken-ichi Okada¹³, Yasuhiro Murata¹⁴, Kenta Murotani¹⁵, Shuji Isaji¹⁴, Masafumi Nakamura¹⁶, Satoshi Hirano¹⁷, Yoshiaki Murakami¹⁸, Yasuhiro Kodera¹, Masaru Miyazaki¹⁹, Masakazu Yamamoto², Hiroki Yamaue¹³, dentify ther²⁰ (1.Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, Nagoya, Japan, 2.Department of Surgery, Institute of Gastroenterology, Tokyo Women’s Medical University, Tokyo, Japan, 3.Department of Surgery, Shinshu University School of Medicine, Matsumoto, Japan, 4.Department of Hepato-Biliary-Pancreatic Surgery, National Hospital Organization Osaka National Hospital, Osaka, Japan, 5.Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan, 6.Department of Surgery, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan, 7.Department of Gastroenterological Surgery, Kochi Health Sciences Center, Kochi, Japan, 8.Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan, 9.Department of Hepato-Biliary-Pancreatic and Transplant Surgery, Fukushima, Japan, 10.Department of Gastroenterological Surgery, Aichi Cancer Center, Nagoya, Japan, 11.Department of Surgery, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan, 12.Department of Surgery, Kansai Medical University, Osaka, Japan, 13.Second Department of Surgery, Wakayama Medical University, Wakayama, Japan, 14.Department of Hepatobiliary Pancreatic and Transplant Surgery, Mie University Graduate School of Medicine, Mie, Japan, 15.Division of Biostatistics, Clinical Research Center, Aichi Medical University Hospital, Aichi, Japan, 16.Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan, 17.Department of Gastroenterological Surgery II, Hokkaido University, Faculty of Medicine, Sapporo, Japan, 18.Department of Surgery, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan, 19.Digestive Diseases Center, International University of Health and Welfare, Mita Hospital, Tokyo, Japan, 20.Department of Surgery and Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan)

^○Yasutsugu Takada (Department of HBP and Breast Surgery, Ehime University Graduate School of Medicine, Ehime, Japan)

^○Yoshihiro Sakamoto¹, Norihiro Kokudo², Takeyuki Watadani³, Junji Shibahara⁴, Masakazu Yamamoto⁵, Hiroki Yamaue⁶ (1.Department of Surgery, Kyorin University Hospital, 2.National Center for Global Health and Medicine, 3.Department of Radiology, The Tokyo University Hospital, 4.Department of Pathology, Kyorin University Hospital, 5.Department of Surgery, Institute of Gastroenterology, Tokyo Woman’s Medical University, 6.2^nd Department of Surgery, Wakayama Medical University)

^○Ken Shirabe^1,2, T Yoshizumi¹, Y Takada³, T Kaido³, M Hidaka³, M Honda³, T Ito³, M Shinoda³, H Ohdan³, N Kawagishi³, Y Sugawara³, Y Ogura³, M Kasahara³, S Kubo³, A Taketomi³, N Yamashita⁴, S Uemoto³, H Yamaue³, M Miyazaki³, T Takada³, Y Maehara¹ (1.Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan, 2.Division of Hepatobiliary and Pancreatic Surgery, Department of General Surgical Science. Gunma University, Maebashi City, Japan, 3.The Study Group of the Japanese Society of Hepato-biliary-Pancreatic Surgery and Japanese Liver Transplantation Society, Tokyo, Japan, 4.Clinical Research Center, Shikoku Cancer Center, Matsuyama, Japan)