1. Department of Gastroenterology and Hepatology; Kindai University Faculty of Medicine; Osaka-sayama Japan
2. Department of Pathology; Kindai University Faculty of Medicine; Osaka-sayama Japan
3. Clinical Research Center; Kindai University Hospital; Osaka-sayama Japan
4. Department of Surgery; Kindai University Faculty of Medicine; Osaka-sayama Japan
5. Gastroenterology Unit, Hospital of Imola; University of Bologna; Bologna Italy