1. Department of Medicine and Clinical Oncology; Graduate School of Medicine Chiba University; 1-8-1 Inohana, Chuo-ku Chiba 260-8677 Japan
2. Department of Gastroenterology and Hepatology; Tokyo Medical University; Tokyo Japan
3. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
4. Section of Hepatobiliary and Pancreatic Surgery; Washington University in Saint Louis School of Medicine; Saint Louis MO USA
5. Department of Surgery; Indiana University School of Medicine; Indianapolis IN USA
6. Department of Internal Medicine; Asan Medical Center, University of Ulsan; Seoul Korea
7. Department of Surgical Gastroenterology; Seth G S Medical College and K E M Hospital; Mumbai India
8. Department of Emergency and Critical Care Medicine; Ichinomiya Municipal Hospital; Ichinomiya Japan
9. Clinical Research Center Kaken Hospital; International University of Health and Welfare; Ichikawa Japan
10. Center for Clinical Infectious Diseases; Jichi Medical University; Shimotsuke Tochigi Japan
11. Department of Surgical Oncology and Gastroenterological Surgery; Sapporo Medical University School of Medicine; Sapporo Japan
12. Department of Surgery; Institute of Gastroenterology, Tokyo Women's Medical University; Tokyo Japan
13. Department of Surgery; Kitakyushu Municipal Yahata Hospital; Kitakyushu Japan
14. Department of Gastroenterological Surgery; Fukuoka University School of Medicine; Fukuoka Japan
15. Department of Radiology; Kanazawa University Graduate School of Medical Science; Kanazawa Japan
16. Department of Endoscopy and Ultrasound; Kawasaki Medical School; Okayama Japan
17. Department of Surgery; Toho University Medical Center Ohashi Hospital; Tokyo Japan