1. Endoscopy Division National Cancer Center Hospital Chuo City Tokyo Japan
2. Department of Gastroenterology and Neurology, Faculty of Medicine Kagawa University Kita‐gun Kagawa Japan
3. Department of General Internal Medicine, Faculty of Medicine Kagawa University Kita‐gun Kagawa Japan
4. Department of Pathology National Cancer Center Hospital Chuo City Tokyo Japan
5. Pathology and Clinical Laboratory Division JR Tokyo General Hospital Shibuya City Tokyo Japan
6. Department of Clinical Laboratory Medicine and Diagnostic Pathology Shiga University of Medical Science Otsu Shiga Japan
7. Department of Hematology National Cancer Center Hospital Chuo City Tokyo Japan