1. Second Department of Surgery; Dokkyo Medical University; 880 Kitakobayashi, Mibu, Tochigi 321-0283 Japan
2. Department of Human Pathology; Kanazawa University Graduate School of Medicine; Kanazawa Japan
3. Department of Pathology; School of Medicine; Teikyo University; Tokyo Japan
4. Department of General Surgery; Graduate School of Medicine; Chiba University; Chiba Japan
5. Department of Surgery; Division of Surgical Oncology; Nagoya University Graduate School of Medicine; Nagoya Japan
6. Department of Surgery; Institute of Gastroenterology; Tokyo Women's Medical University; Tokyo Japan
7. Department of Gastroenterology; Graduate School of Medicine; The University of Tokyo; Tokyo Japan
8. Department of Hepatobiliary Pancreatic and Transplant Surgery; Mie University School of Medicine; Mie Japan
9. Department of Surgery; Kurume University School of Medicine; Fukuoka Japan
10. Internal Medicine; Tokyo Metropolitan Komagome Hospital; Tokyo Japan
11. Department of Gastroenterology; Second Teaching Hospital Fujita Health University; Nagoya Japan