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.