1. Department of Gastrointestinal Medicine and Internal Medicine Kuroishi General Hospital Kuroishi Japan
2. Department of Gastroenterology and Hematology Hirosaki University Graduate School of Medicine Hirosaki Japan
3. Department of Oncology Hirosaki University Graduate School of Medicin Hirosaki Japan
4. Department of Diagnostic Pathology Hachinohe City Hospital Hachinohe Japan