1. Department of Gastroenterology and Hepatology, Japanese Red Cross Okayama Hospital, Okayama 700‑8607, Japan
2. Department of Radiology, Japanese Red Cross Okayama Hospital, Okayama 700‑8607, Japan
3. Department of Pathology, Japanese Red Cross Okayama Hospital, Okayama 700‑8607, Japan
4. Department of Gastroenterology and Hepatology, Okayama University Hospital, Okayama 700‑8558, Japan