1. Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai, Miyagi 980‑8574, Japan
2. Department of Gastroenterology, Japanese Red Cross Ishinomaki Hospital, Ishinomaki, Miyagi 986‑8522, Japan
3. Department of Hepatology, Tohoku Rosai Hospital, Sendai, Miyagi 981‑8563, Japan
4. 4Department of Gastroenterology, Japan Community Health care Organization Sendai Hospital, Sendai, Miyagi 981‑8501, Japan
5. Department of Internal Medicine, Kesen‑numa City Hospital, Kesennuma, Miyagi 988‑0181, Japan