1. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
2. Division of Medical Support, Okayama University Hospital, Okayama 700-8558, Japan
3. Department of Pathology & Experimental Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
4. Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
5. Department of Hematology and Oncology, Okayama University Hospital, Okayama 700-8558, Japan
6. Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
7. Department of Radiology, Okayama University Hospital, Okayama 700-8558, Japan
8. Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
9. Department of Practical Gastrointestinal Endoscopy, Okayama University Hospital, Okayama 700-8558, Japan