1. Department of Gastroenterology and NGERE unit; University Hospital of Nancy and Inserm; Lorraine University; Vandoeuvre-lès-Nancy France
2. Department of Gastroenterology; University Hospital Southampton NHS Foundation Trust and Faculty of Medicine; University of Southampton; Southampton UK
3. Department of Medicine I; Agaplesion Markus Hospital and Crohn Colitis Clinical Research Center Rhein-Main; Frankfurt/Main Germany
4. Department of Gastroenterology; Akershus University Hospital HF and Institute of Clinical Medicine, University of Oslo; Norway
5. IBD Center and Department of Biomedical Sciences; Humanitas Clinical and Research Center; Humanitas University; Milan Italy