1. Department of Gastroenterology and Hepatology Radboud university medical center Nijmegen the Netherlands
2. Academic Department of Gastroenterology Royal Hallamshire Hospital Sheffield Teaching Hospitals NHS Trust Sheffield UK
3. Department of Infection, Immunity and Cardiovascular Diseases University of Sheffield Sheffield UK
4. Interventional and Experimental Endoscopy (InExEn) Department of Internal Medicine II University Hospital Würzburg Würzburg Germany
5. Department of Gastroenterology and Hepatology Leiden University Medical Center Leiden the Netherlands
6. Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology and Infectious Diseases University Medical Center Regensburg Regensburg Germany