1. Department of Pathology Nihon University School of Medicine Tokyo Japan
2. Department of Diagnostic Pathology Saitama Medical University International Medical Center Hidaka Saitama Japan
3. Department of Diagnostic Pathology Ageo Central General Hospital Ageo Saitama Japan
4. Division of Gastroenterology and Hepatology Department of Medicine Nihon University School of Medicine Tokyo Japan
5. Department of Digestive Surgery Nihon University School of Medicine Tokyo Japan
6. Department of Pathology Jikei University School of Medicine Tokyo Japan
7. Department of Human Pathology Juntendo University Graduate School of Medicine Tokyo Japan
8. Department of Pathology The Cancer Institute of Japanese Foundation for Cancer Research Tokyo Japan
9. Department of Pathology Saitama Cancer Center Ina Saitama Japan
10. Department of Pathology Saint Luke's International Hospital Tokyo Japan
11. Department of Internal Medicine Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
12. Department of Gastroenterological Surgery Tokyo Women's Medical University Tokyo Japan
13. Diagnostic Pathology Division Tokyo Medical University Ibaraki Medical Center Ibaraki Japan
14. Pathology Division Ebina General Hospital Ebina Kanagawa Japan
15. Department of Pathology Tokai University School of Medicine Isehara Kanagawa Japan
16. Tokyo Central Pathology Laboratory Tokyo Japan