1. Department of Gastroenterology, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust , Cambridge , UK
2. Medical Research Council Clinical Trials Unit, University College London , London , UK
3. Department of Gastroenterology, Viseu Unit, Tondela-Viseu Hospital Centre , 3504-509 Viseu , Portugal
4. Medical Faculty of the University of Münster, Münster, NRW , Germany
5. Department of Gastroenterology, Hospital Clínico Universitario Lozano Blesa, CIBERehd Avenida San Juan Bosco 15, 50009 Zaragoza , Spain
6. Aragón Health Research Institute (IIS Aragón), Avenida San Juan Bosco 9, 50009 Zaragoza , Spain
7. University of Zaragoza, School of Medicine , Spain
8. Department of Internal Medicine and Pediatrics, Ghent University , Ghent , Belgium
9. Department of Gastroenterology, University Hospital Ghent , Ghent , Belgium
10. Imelda GI Clinical Research Centre, Department of Gastroenterology, Imelda General Hospital , Bonheiden , Belgium
11. Gastroenterology Unit, Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria Princesa (IIS-Princesa), Universidad Autónoma de Madrid (UAM), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd) , 28006 Madrid , Spain
12. Department of Gastroenterology, University of Melbourne, St Vincent’s Hospital , Melbourne , Australia
13. Gastroenterology Research Unit, Department of Experimental and Clinical Biomedical Sciences ‘Mario Serio’, University of Florence , Florence , Italy
14. IBD Referral Center, Gastroenterology Department, Careggi University Hospital , Florence , Italy
15. Department of Gastroenterology and Endoscopy, IRCCS San Raffaele Hospital , Milan , Italy
16. University of Groningen, Department of Paediatric Gastroenterology, Hepatology and Nutrition, University Medical Center Groningen , Groningen , The Netherlands
17. Department of Hepato-Gastroenterology and Digestive Oncology, Liege University Hospital, CHU Liege , Belgium
18. Center for Inflammatory Bowel Diseases, Division of Gastroenterology, Beth-Israel Deaconess Medical Center, Harvard Medical School , Boston, MA , USA