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.