1. Department of Gastroenterology, Barts Health NHS Trust , London , UK
2. Centre for Immunobiology, Blizard Institute, Barts & The London Medical School, Queen Mary University of London , London , UK
3. Department of Systems Medicine, University ‘Tor Vergata’ of Rome , Rome , Italy
4. IBD Unit, Department of Gastroenterology and Digestive Endoscopy, San Camillo-Forlanini Hospital , Rome , Italy
5. Department of gastroenterology, Vita-Salute San Raffaele University , Milan , Italy
6. Division of Gastroenterology, Department of Internal Medicine, University of Ioannina School of Health Sciences , Ioannina , Greece
7. Sheba Medical Center, Ramat Gan, and Sackler School of Medicine, Tel Aviv University , Tel Aviv , Israel
8. Department of Gastroenterology, Cambridge University Hospitals NHS Foundation Trust , Cambridge , UK
9. Department of Medicine, Division of Gastroenterology, NYU Grossman School of Medicine , New York, NY , USA
10. University Medical Unit, Teaching Hospital Jaffna , Jaffna , Sri Lanka
11. Gastrounit, Copenhagen University Hospital Amager and Hvidovre , Hvidovre , Denmark
12. Copenhagen Center for Inflammatory Bowel Disease in Children, Adolescents and Adults, Copenhagen University Hospital Amager and Hvidovre , Hvidovre , Denmark
13. Paediatric Gastroenterology, Erasmus University Medical Center Rotterdam , Rotterdam , The Netherlands
14. Inflammatory Bowel Disease Center, Department of Gastroenterology and Hepatology, Radboud University Medical Center , Nijmegen , The Netherlands
15. Department of Gastroenterology and Hepatology, Erasmus MC, University Medical Centre Rotterdam , Rotterdam , The Netherlands
16. Division of Gastroenterology, Department of Medicine, Mater Dei Hospital , Msida , Malta
17. Division of Gastroenterology and Hepatology, GZO Zurich Regional Health Center , Wetzikon , Switzerland
18. Division of Gastroenterology and Hepatology, University Hospital Lausanne CHUV , Lausanne , Switzerland
19. Institute of Immunology and Immunotherapy, University of Birmingham , Birmingham , UK
20. NIHR Wellcome Trust Clinical Research Facility, University Hospital Birmingham , Birmingham , UK
21. Department of Gastroenterology, Wellington Hospital , Wellington , New Zealan
22. Gastroenterology Department, Attikon University Hospital , Athens , Greece
23. Department of Gastroenterology, Venizeleio General Hospital , Heraklion , Greece
24. Sorbonne Université, Institut Pierre Louis d’Epidémiologie et de Santé Publique, Hôpital Saint-Antoine, Department of Gastroenterology , Paris , France
25. CHU de Bordeaux, Hôpital Haut-Lévêque, Service d’Hépato-gastroentérologie et Oncologie Digestive, Université de Bordeaux , Bordeaux , France
26. Department of Internal Medicine and Pediatrics, Ghent University , Ghent , Belgium
27. Department of Gastroenterology, Ghent University Hospital, Ghent , Belgium
28. University of Szeged, Faculty of Medicine, Department of Internal Medicine, Gastroenterology , Szeged , Hungary
29. Department of gastroenterology, Royal London Hospital, Barts Health NHS Trust , London , UK
30. Gastroenterology Unit, Rho Hospital, ASST Rhodense , Rho (MI) , Italy
31. Department of Gastroenterology and Hepatology, University Hospital Zürich, Zürich , Switzerland