1. Division of GI Services, University College London Hospitals NHS Foundation Trust , London , UK
2. Department of Surgery and Cancer or Department of Metabolism, Digestion and Reproduction, Imperial College London , London , UK
3. Department of Gastroenterology or Department of Colorectal Surgery, St Mark’s Hospital , London , UK
4. Department of Gastroenterology, Royal Free Hospital , London , UK
5. Department of Surgery, Nottingham University Hospitals NHS Trust , Nottingham , UK
6. Department of Surgery, University of Health Sciences Tepecik Training and Research Hospital , Izmir , Turkey
7. Department of Surgery, Mount Sinai Hospital, University of Toronto , Toronto , Canada
8. Department of Biomedical Sciences, Humanitas University , Milan , Italy
9. Department of Surgery, IRCCS Humanitas Research Hospital , Milan , Italy
10. Department of Gastroenterology, Austin Health , Melbourne, VIC , Australia
11. Division of Medicine, Dentistry and Health Sciences, University of Melbourne, Austin Academic Centre , Melbourne, VIC , Australia
12. Department of Gastroenterology, Guy’s and St Thomas’ NHS Foundation Trust and King’s College London , London , UK
13. Department of Gastroenterology, Addenbrooke’s Hospital , Cambridge , UK
14. Department of Medicine, University of Cambridge , Cambridge , UK
15. Department of Gastroenterology, Darlington Memorial Hospital, County Durham & Darlington NHS Foundation Trust , Darlington , UK
16. Department of Gastroenterology, Teesside University , UK, Middlesbrough , UK
17. Edinburgh IBD Unit, NHS Lothian, Western General Hospital , Edinburgh , UK
18. Department of Gastroenterology, King’s College Hospital , London , UK
19. Department of Gastroenterology, St. George’s University Hospitals NHS Foundation Trust , London , UK
20. Division of Gastroenterology, Department of Internal Medicine, University of Ioannina School of Health Sciences , Ioannina , Greece
21. Translational & Clinical Research Institute, Newcastle University , Newcastle upon Tyne , UK
22. Department of Gastroenterology, Royal Victoria Infirmary , Newcastle upon Tyne, Newcastle upon Tyne , UK
23. Department of Gastroenterology, Northern Care Alliance NHS Foundation Trust , Greater Manchester , UK
24. Department of Gastroenterology, University of Manchester , Manchester , UK
25. Department of Surgery, Worcestershire Acute Hospitals NHS Trust , Worcester , UK
26. Department of Surgery, Linköping University Hospital , Linköping , Sweden
27. Department of Biomedical and Clinical Sciences, Linköping University , Linköping , Sweden
28. Department of Gastroenterology, Cambridge University Hospitals, Addenbrooke’s Hospital , Cambridge , UK
29. Department of Surgery, Aretaieion Hospital, National and Kapodistrian University of Athens, A thens , Greece
30. Instituto de Investigación Biosanitaria ibs.GRANADA , Granada , Spain
31. Escuela Andaluza de Salud Pública [EASP] , Granada , Spain
32. CIBER of Epidemiology and Public Health [CIBERESP] , Madrid , Spain
33. Department of Gastroenterology, Guy’s and St Thomas’ NHS Foundation Trust , London , UK
34. Faculty of Life Sciences and Medicine, King’s College London , London , UK
35. Department of Surgery, University Hospitals Birmingham , Birmingham , UK
36. Department of Surgery, Austin Health , Heidelberg Victoria, VIC , Australia
37. Department of Gastroenterology, Royal London Hospital, Barts Health NHS Trust , London , UK
38. Department of Gastroenterology, Hull University Teaching Hospitals NHS Trust , Hull , UK
39. Department of Gastroenterology, Northern Hospital Epping, University of Melbourne , Melbourne, VIC , Australia
40. Department of Gastroenterology, Leeds Teaching Hospitals NHS Trust , Leeds , UK
41. Department of Surgery, Nottingham University Hospitals , UK
42. Department of Surgery, University Hospital Leuven , The Netherlands