1. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan
2. Department of Pathology, Okayama University Hospital, Japan
3. Department of Rheumatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan
4. Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan