1. Department of Gastroenterology and Hepatology; Tokyo Medical University; 6-7-1 Nishishinjuku, Shinjuku-ku Tokyo 160-0023 Japan
2. Department of Gastroenterology, Graduate School of Medicine; The University of Tokyo; Tokyo Japan
3. Tokyo Medical University; Tokyo Japan
4. Department of Gastroenterology; Well Cornell Medical Center; New York NY USA
5. Department of Surgery and Cancer; Imperial College London; London UK
6. Department of Pathology; Tokyo Medical University; Tokyo Japan
7. Department of Clinical Oncology; Tokyo Medical University; Tokyo Japan
8. Third Department of Surgery; Tokyo Medical University; Tokyo Japan
9. Department of Gastroenterology; Hokkaido University Graduate School of Medicine; Sapporo Japan