1. Division of Gastroenterology, Iwate Medical University, Morioka, Japan
2. Department of Endoscopic Diagnostics and Therapeutics, Saga University Hospital, Saga, Japan
3. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
4. Division of Gastroenterology, Matsuyama Red Cross Hospital, Matsuyama, Japan
5. Department of Diagnostic Pathology, Iwate Medical University, Morioka, Japan
6. Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
7. Department of Pathology, Matsuyama Red Cross Hospital, Matsuyama, Japan
8. Division of Pulmonary Medicine, Allergy, and Rheumatology, Iwate Medical University, Morioka, Japan
9. Division of Neurology and Gerontology, Department of Internal Medicine, Iwate Medical University, Morioka, Japan