1. Department of Gastroenterology; Ogaki Municipal Hospital; 4-86 Minaminokawa Ogaki Gifu 503-0864 Japan
2. Department of Radiology, Graduate School of Medical Science; Kanazawa University; Ishikawa Japan
3. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
4. Department of Surgical Oncology and Gastroenterological Surgery; Sapporo Medical University Graduate School of Medicine; Sapporo Japan
5. Department of Hemodialysis and Surgery; Clinical Research Center, Kaken Hospital, International University of Health and Welfare; Chiba Japan
6. Department of Emergency and Critical Care Medicine; Nagoya University Graduate School of Medicine; 65 Tsurumai, Showa Nagoya Aichi 466-8560 Japan
7. Department of Surgery; Kumamoto Regional Medical Center; Kumamoto Japan
8. Department of Radiology; Shinshu University School of Medicine; Matsumoto Japan
9. Department of Radiology; St. Marianna University Yokohama Seibu Hospital; Yokohama Japan
10. Department of Radiology; National Hospital Organization Disaster Medical Center; Tokyo Japan
11. Department of Surgery; National Hospital Organization Sendai Medical Center; Sendai Japan
12. Department of Healthcare Economics and Quality Management; Kyoto University Graduate School of Medicine; Kyoto Japan
13. Critical Care and Emergency Center; Yokohama City University Medical Center; Yokohama Japan
14. General Internal Medicine; Japanese Red Cross Society Nagoya Daini Hospital; Nagoya Japan
15. Division of Gastroenterology; Tohoku University Graduate School of Medicine; Sendai Japan