1. Department of Pathology; University Hospital of Reims; Reims France
2. Deparment of Pathology and Laboratory Medicine; Mt Sinai Hospital; Toronto ON Canada
3. Division of Gastroenterology; Department of Internal Medicine; McMaster University; Hamilton ON Canada
4. Department of Gastroenterology; IBD Center; Humanitas Research Hospital; Rozzano Milan Italy
5. Department Medicine I; University-Hospital Schleswig-Holstein; Kiel Germany
6. Inserm U954 and Department of Hepato-Gastroenterology; University Hospital of Nancy; Lorraine Univeristy; Vandoeuvre-lès-Nancy France