1. Second Department of Internal Medicine Wakayama Medical University Wakayama Japan
2. Clinical Study Support Center Wakayama Medical University Hospital Wakayama Japan
3. Department of Gastroenterology Jean Mermoz Private Hospital Ramsay Générale de Santé Lyon France
4. University of Bologna/Hospital of Imola Imola Italy
5. Department of Gastroenterology and Hepatology Kindai University Faculty of Medicine Osaka Japan