1. Department of Surgical Oncology and Gastroenterological Surgery; Sapporo Medical University School of Medicine; Minami 1, Nishi 16, Chuo-ku Sapporo 060-8543 Japan
2. Critical Care and Emergency Center, Yokohama City University Medical Center; Yokohama Japan
3. Department of Surgery; Teikyo University School of Medicine; Tokyo 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. Department of Surgery; Kumamoto Regional Medical Center; Kumamoto Japan
7. Department of Surgery; National Hospital Organization Sendai Medical Center; Sendai Japan
8. Department of Radiology, Graduate School of Medical Science; Kanazawa University; Ishikawa Japan
9. Department of Healthcare Economics and Quality Management; Kyoto University Graduate School of Medicine; Kyoto Japan
10. Division of Gastroenterology; Tohoku University Graduate School of Medicine; Sendai Japan
11. General Internal Medicine; Japanese Red Cross Society Nagoya Daini Hospital; Nagoya Japan
12. Department of Gastroenterology; Ogaki Municipal Hospital; Ogaki Japan
13. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan