1. 2nd Department of Internal Medicine, Osaka Medical College, Osaka, Japan
2. Clinical Research Center, Kinki University Hospital, Osaka-Sayama, Japan
3. Department of Gastroenterology and Hepatology, Kinki University Faculty of Medicine, Osaka-Sayama, Japan
4. Department of Radiology, Osaka Medical College, Osaka, Japan
5. Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan