1. Department of Gastroenterology, Ulster Hospital, South Eastern Trust, Dundonald, Belfast, UK
2. Department of Biomedical Sciences, Humanitas University, Milan, Italy
3. IBD Center, Humanitas Clinical and Research Center, Milan, Italy
4. Department of Hepato-Gastroenterology and Inserm U954, University Hospital of Nancy, Lorraine University, Vandoeuvre-lès-Nancy, France