Hyogo Medical University, Wakayama Medical University, Wakayama Medical University, Kansai Medical University, Nara Medical University School of Medicine - Department of Surgery, Nagoya University, Kindai University, University of Toyama, Shimane University, Hiroshima University Graduate School of Biomedical and Health Sciences - Department of Surgery, Osaka Metropolitan University, Kagoshima University, Tokyo Medical University, Kumamoto University, Kyoto Prefectural University, Kyushu University, Wakayama Medical University, Wakayama Medical University, Wakayama Medical University and Showa University

Nagoya University Graduate School of Medicine - Department of Gastroenterological Surgery (Surgery II), University of Toyama - Department of Surgery and Science, Nagoya University Graduate School of Medicine - Department of Gastroenterological Surgery (Surgery II), Wakayama Medical University - Second Department of Surgery, University of Toyama - Department of Surgery and Science, Kindai University - Department of Surgery, Oita Red Cross Hospital - Department of Surgery, Kumamoto University - Department of Gastroenterological Surgery, Showa University - Department of Gastroenterological and General Surgery, Tohoku University Graduate School of Medicine - Division of Hepato-Biliary Pancreatic Surgery, Kansai Medical University - Department of Surgery, National Defense Medical College - Department of Surgery, Hyogo College of Medicine - Department of Gastroenterological Surgery, Hiroshima University Graduate School of Biomedical and Health Sciences - Department of Surgery, Fujita Health University - Bantane Hospital, Department of Gastroenterological Surgery, Nara Medical University School of Medicine - Department of Surgery, Kansai Rosai Hospital - Japan Organization of Occupational Health and Safety, Department of Surgery, Wakayama Medical University - Clinical Study Support Centre, Nagoya University Graduate School of Medicine - Department of Gastroenterological Surgery (Surgery II) and Wakayama Medical University - Second Department of Surgery

Kansai Medical University, Kurume University, University of Toyama, Nagoya University, Nagoya University, Kindai University, Hiroshima University, Kansai Medical University, Kansai Medical University, Kansai Medical University, University of Toyama, University of Toyama, University of Toyama - Department of Surgery and Science, Nagoya Central Hospital, Wakayama Medical University, Nagoya University, Nagoya University, Kindai University, Kindai University, Hiroshima University, Hiroshima University Graduate School of Biomedical and Health Sciences - Department of Surgery, Hokkaido University, Tokyo Medical University, Kyoto Prefectural University of Medicine - Department of Molecular-Targeting Prevention and Kansai Medical University