We thank all patients who participated in this trial and their families. We are indebted to the physicians and all clinical study teams at the participating institutions. The following departments and hospitals participated in the trial: Department of Surgery and Science, Kyuhsu University (Fukuoka, Japan); Department of Surgery, Saiseikai Fukuoka General Hospital (Fukuoka, Japan); Department of Surgery, Minoh City Hospital, Minoh, Japan; Department of Gastroenterological Surgery, Aichi Cancer Center, Aichi Hospital (Nagoya, Japan);Division of Lower GI Department of Surgery, Hyogo College of Medicine (Nishinomiya, Japan); Department of Surgery, Kitasato University School of Medicine (Kanagawa, Japan); Kochi University Department of Surgery (Nankoku, Japan); Department of Surgery, Kurume University Medical Center (Kurume, Japan); Division of Gastroenterological Surgery, Chiba Cancer Center (Chiba, Japan); Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University (Kumamoto, Japan); Department of Digestive Surgery, Breast and Thyroid Surgery, Graduate School of Medical Sciences, Kagoshima University (Kagoshima, Japan); Department of Surgery, Aomori Prefectural Central Hospital (Aomori City, Japan); Division of Surgical Oncology, Department of Translational Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences (Nagasaki, Japan); Department of Surgery, University of Tokushima (Tokushima, Japan); Asahikawa Medical University Hospital (Asahikawa, Japan); Department of Surgery, Gifu Municipal Hospital (Gifu, Japan); Department of Gastroenterological Surgery, Nagoya University Graduate School of Medicine (Nagoya, Japan); Department of Surgery I, Dokkyo University School of Medicine (Shimotsuga, Japan); Department of Gastroenterological Surgery, Kyushu National Medical Center (Fukuoka, Japan); Japanese Red Cross Kanazawa Hospital (Kanazawa, Japan); First Department of Surgery, University of Fukui (Fukui, Japan); Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University (Osaka, Japan); First Department of Surgery, Ryukyu University, School of Medicine (Okinawa, Japan); Aichi Cancer Center Aichi Hospital; Department of Surgery, Fujita Health University (Toyoake, Japan); Department of General Surgery, Kawasaki Medical School (Okayama, Japan); Department of Surgical Oncology and Gastroenterological Surgery, Sapporo Medical University (Sapporo, Japan); Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Science (Okayama, Japan); Department of Surgical Oncology, Gifu University Graduate School of Medicine (Gifu, Japan); Hamamatsu University School of Medicine (Shizuoka, Japan); Department of Surgery, Kyoto University Graduate School of Medicine (Kyoto, Japan); Department of Gastroenterological Surgery, Hirosaki University Graduate School of Medicine (Hirosaki, Japan); Osaka Medical College (Osaka, Japan); Department of Surgery, Kansai Medical University (Osaka, Japan); Nihon University Itabashi Hospital (Tokyo, Japan); Kanazawa Medical University, Department of Surgical Oncology (Ishikawa, Japan); Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical School (Saitama, Japan); Kansai Rosai Hospital (Amagasaki, Japan); Department of Gastrointestinal Surgery, Kobe University (Kobe, Japan). This clinical trial was totally supported by a Ministry of Health, Labour and Welfare Grant-in-Aid for Scientific Research in Japan (Tokyo, Japan). We also thank Ms. Satomi Abe and Ms. Masako Yamashita from the Kyushu University Data Center and the EPS Corporation (Tokyo, Japan) for their excellent secretarial assistance.
Conflict of interest
Yoshihiko Maehara received a research grant from Yakult Honsha and Tsumura & Co.; Toru Kono received a research Grant from Tsumura & Co; Eiji Oki and Takeshi Kato received lecture fees from Yakult Honsha; the other authors have no conflict of interest.