1. Department of Gastroenterology; Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine; Sapporo Japan
2. Department of Medical Oncology; Dana-Farber Cancer Institute and Harvard Medical School; Boston MA
3. Department of Gastroenterology; Keiyukai Sapporo Hospital; Sapporo Japan
4. Department of Gastroenterology; NTT East Sapporo Hospital; Sapporo Japan
5. Department of Pathology; Keiyukai Sapporo Hospital; Sapporo Japan
6. Department of Surgical Pathology; Sapporo Medical University School of Medicine; Sapporo Japan
7. Department of Surgery; Surgical Oncology and Science, Sapporo Medical University School of Medicine; Sapporo Japan
8. Department of Molecular Biology; Sapporo Medical University School of Medicine; Sapporo Japan
9. The Institute of Medical Science, The University of Tokyo; Tokyo Japan
10. Division of Gastroenterology and Hepatology; St. Marianna University School of Medicine; Kawasaki Japan