1. Department of Surgery, Graduate School of Medicine; Osaka University; Suita Japan
2. Department of Gastroenterological, Breast and Endocrine Surgery; Yamaguchi University Graduate School of Medicine; Ube Japan
3. Department of Gastroenterology and Hepatology; Kyoundo Hospital of the Sasaki Institute; Tokyo Japan
4. Department of Surgery, Graduate School of Medicine; Kyoto University; Kyoto Japan
5. Department of Gastroenterology; Kanazawa University Hospital; Kanazawa Japan
6. Department of Gastroenterology; University of Tokyo; Tokyo Japan
7. Department of Clinical Oncology; Kochi Health Science Center; Kochi Japan
8. Department of Surgery, Division of Frontier Medical Science, Programs for Biomedical Research, Graduate School of Biomedical Sciences; Hiroshima University; Hiroshima Japan
9. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine; Dentistry and Pharmaceutical Sciences; Okayama Japan
10. Division of Gastroenterology, Department of Medicine; Kurume University School of Medicine; Kurume Japan
11. Department of Hepato-Biliary-Pancreatic Surgery; Osaka City University Graduate School of Medicine; Osaka Japan
12. Department of Surgery, Surgical Oncology & Science; Sapporo Medical University; Sapporo Japan
13. Division of Hepatobiliary and Pancreatic Disease, Department of Internal Medicine; Hyogo College of Medicine; Nishinomiya Japan
14. Department of Biostatistics; Yokohama City University School of Medicine; Yokohama Japan
15. Translational Research Informatics Center; Foundation for Biomedical Research and Innovation; Kobe Japan