1Department of Medicine, Mount Sinai Hospital IBD Centre, University of Toronto, Toronto, Ontario, Canada
2Department of Gastroenterology, Western General Hospital, University of Edinburgh, Edinburgh, UK
3Gastroenterology Unit, University of Oxford, Gibson Laboratories, Radcliffe Infirmary, Oxford, UK
4Department of Medicine, Section of Gastroenterology, University of Manitoba IBD Clinical and Research Centre, Winnipeg, Manitoba, Canada
5The Harvey M and Lyn P Meyerhoff Inflammatory Bowel Disease Center, Department of Medicine, John Hopkins University School of Medicine, and Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
6Department of Clinical Sciences, University of Rome La Sapienza, Rome, Italy
7Department of Hepatogastroenterology and Registre EPIMAD, Hôpital HURIEZ, CH et U Lille, France
8Division of Gastroenterology and Hepatology, Medical University of Vienna, Vienna, Austria
9Department of Pathology, University Hospital, Leuven, Belgium
10Department of Gastroenterology, University of Oxford, Oxford, UK
11Department of Gastroenterology, Rambam Medical Center, Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
12Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, Minnesota, USA
13Department of Pathology, VU University Medical Centre, Amsterdam, The Netherlands
14Department of Pathology, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
15Mount Sinai School of Medicine, New York, USA
16Institute for Clinical Molecular Biology, Christian-Albrechts-University, Kiel, Germany
17Cedars-Sinai Division of Gastroenterology, Inflammatory Bowel Disease Center and Immunobiology Institute, UCLA School of Medicine, Los Angeles, California, USA
18Division of Gastroenterology, University Hospital Gasthuisberg, Leuven, Belgium
19Department of Cellular Pathology, John Radcliffe Hospital, University of Oxford, Oxford, UK