1. Department of Gastroenterology and Hematology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan;
2. Department of Community Healthcare Development in Odate and North Akita, Hirosaki University Graduate School of Medicine, Hirosaki, Japan;
3. Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Hirosaki, Japan;
4. Department of Anatomic pathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan;
5. Shibata Irika Co.Ltd, Hirosaki, Japan;
6. Department of Community Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan;
7. Division of Endoscopy, Hirosaki University Hospital, Hirosaki, Japan;
8. Division of Clinical Research, Hirosaki National Hospital, National Hospital Organization, Hirosaki, Japan