1. Department of Surgery; National Hospital Organization Sendai Medical Center; 2-2-8 Miyagino, Miyagino-ku Sendai 983-8520 Japan
2. General Internal Medicine; Japanese Red Cross Society Nagoya Daini Hospital; Nagoya Japan
3. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
4. Otsu Municipal Hospital; Otsu Japan
5. Department of Hemodialysis and Surgery; Clinical Research Center, Kaken Hospital, International University of Health and Welfare; Chiba Japan
6. Department of Radiology, Graduate School of Medical Science; Kanazawa University; Ishikawa Japan
7. Department of Surgery; Kumamoto Regional Medical Center; Kumamoto Japan
8. Department of Emergency and Critical Care Medicine; Nagoya University Graduate School of Medicine; Nagoya Japan
9. Department of Radiology; Shinshu University School of Medicine; Matsumoto Japan
10. Department of Radiology; St. Marianna University Yokohama Seibu Hospital; Yokohama Japan
11. Department of Radiology; National Hospital Organization Disaster Medical Center; Tokyo Japan
12. Department of Healthcare Economics and Quality Management; Kyoto University Graduate School of Medicine; Kyoto Japan
13. Department of Surgical Oncology and Gastroenterological Surgery; Sapporo Medical University Graduate School of Medicine; Sapporo Japan
14. Department of Gastroenterology; Ogaki Municipal Hospital; Ogaki Japan
15. Critical Care and Emergency Center; Yokohama City University Medical Center; Yokohama Japan
16. Department of Surgery; Kinki University School of Medicine; Osaka Japan
17. Division of Gastroenterology; Tohoku University Graduate School of Medicine; Sendai Japan