1. Critical Care and Emergency Center; Yokohama City University School of Medicine; 4-57 Urafune, Minami Yokohama 232-0024 Japan
2. Department of Surgery; Teikyo University School of Medicine; Tokyo Japan
3. Department of Surgical Oncology and Gastroenterological Surgery; Sapporo Medical University Graduate School of Medicine; Sapporo Japan
4. Department of Hemodialysis and Surgery, Clinical Research Center, Kaken Hospital; International University of Health and Welfare; Chiba Japan
5. Department of Emergency and Critical Care Medicine; Nagoya University Graduate School of Medicine; Nagoya Japan
6. Division of Gastroenterology; Tohoku University Graduate School of Medicine; Sendai Japan
7. General Internal Medicine; Japanese Red Cross Society Nagoya Daini Hospital; Nagoya Japan
8. Department of Surgery; Kumamoto Regional Medical Center; Kumamoto Japan
9. Department of Gastroenterology; Ogaki Municipal Hospital; Ogaki Japan
10. Department of Healthcare Economics and Quality Management; Kyoto University Graduate School of Medicine; Kyoto Japan
11. Department of Radiology, Graduate School of Medical Science; Kanazawa University; Ishikawa Japan
12. Department of Surgery; National Hospital Organization Sendai Medical Center; Sendai Japan
13. Otsu Municipal Hospital; Otsu Japan
14. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
15. Department of Surgery and Oncology, Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan