1. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan
2. Department of Endoscopy, Okayama University Hospital, Japan
3. Department of Pathology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan
4. Department of Internal Medicine, Tsuyama Chuo Hospital, Japan
5. Department of Gastroenterology, Kagawa Prefectural Central Hospital, Japan
6. Department of Internal Medicine, Hiroshima City Hospital, Japan
7. Department of Hepatology, Japanese Red Cross Okayama Hospital, Japan
8. Department of Gastroenterology, Iwakuni Clinical Center, Japan
9. Department of Internal Medicine, Okayama Saiseikai General Hospital, Japan
10. Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan