1. Department of Gastroenterology, Royal Liverpool Hospital, Liverpool University Hospital Foundation NHS Trust, Liverpool, UK
2. Division of Medicine, University of Liverpool, Liverpool, UK
3. Gastroenterology Unit, Peritox UMR I-0I, Amiens University and Hospital, Université de Picardie Jules Verne, Amiens, France
4. Gastroenterology and Liver Services, Concord Hospital, Sydney, NSW, Australia
5. Department of Gastroenterology, Macquarie University Hospital, Sydney, NSW, Australia
6. Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Canada
7. Agaplesion Markus Hospital, Goethe University, Frankfurt/Main, Germany