¹IBUS studygroup, 1Hvidovre Hospital-, Gastrounit- Division of Medicine, Copenhagen, Denmark, ²Haukeland University Hospital, Department of medicine, Bergen, Norway, ³University Teaching Hospital Lueneburg., Department of Internal Medicine and Gastroenterology-, Lueneburg, Germany, ⁴Amsterdam University Medical Centers, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ⁵University Teaching Hospital Lueneburg, Outpatients Department of Gastroenterology, Lueneburg, Germany, ⁶’Luigi Sacco’ University Hospital- University of Milan, Gastroenterology Unit- Department of Biomedical and Clinical Sciences, Milan, Italy, ⁷Humanitas University, Department of Gastroenterology, Milan, Italy, ⁸University of Calgary, Department of Medicine- Division of Gastroenterology, Calgary, Canada, ⁹Hospital Beatriz Ângelo, Gastroenterology Department, Loures, Portugal, ¹⁰The Royal Melbourne Hospital, Gastroenterology Department, Melbourne, Australia

¹Sheba Medical Center Tel Hashomer, Gastroenterology Institute, Ramat gan, Israel, ²Tel-Aviv University, Sackler School of Medicine, Tel Aviv, Israel, ³ISCARE I.V.F. a.s ibd, IBD Clinical and Research Centre, Prague, Czech Republic, ⁴University Medical Centre Ljubljana, Department of Gastroenterology, Ljubljana, Slovenia, ⁵Rambam Health Care Campus, Bruce and Ruth Rappaport Faculty of Medicine, Haifa, Israel, ⁶University Hospital of Saint-Etienne, Department of Hepatogastroenterology, Saint-Etienne, France, ⁷University of Porto, Department of Biomedicine- Unit of Pharmacology and Therapeutics- Faculty of Medicine, Porto, Portugal, ⁸University of Lisbon, Instituto de Saúde Ambiental- Faculty of Medicine, Lisbon, Portugal, ⁹University of Ljubljana, Medical Faculty, Ljubljana, Slovenia

University of Liverpool, Biostatistics, Liverpool, UK

¹St Mark’s Hospital, Department of Gastroenterology, London, UK, ²National Institute for Health Research, Applied Research Collaborations, London, UK, ³Patient Information Forum, Head of Strategy and Partnership, London, UK

¹Department of Gastroenterology and Hepatology, Amsterdam UMC – Location AMC, Amsterdam, The Netherlands, ²Department of Gastroenterology and Hepatology, University Medical Center Ljubljana, Ljubljana, The Netherlands

Barts Health, Gastroenterology, London, UK

Hospital Universitario La Paz, Gastroenterology, Madrid, Spain

¹Icahn School of Medicine at Mount Sinai- New York, The Dr Henry D. Janowitz Division of Gastroenterology, New York, USA, ²Hospital and University Center of Coimbra – Portugal, Division of Gastroenterology, Coimbra, Portugal, ³Icahn School of Medicine at Mount Sinai – New York, Levy Library, New York, USA

¹Department of General Surgery, Maastricht University Medical Center, Maastricht, The Netherlands, ²Department of Gastroenterology, University Medical Center Groningen, Groningen, The Netherlands, ³Department of General Surgery, University Medical Center Groningen, Groningen, The Netherlands, ⁴Department of General Surgery, Amsterdam University Medical Centre, Amsterdam, The Netherlands

¹Department of Gastroenterology, University of California San Diego, San Diego, USA, ²Department of Gastroenterology, University of Western Ontario, London, Canada, ³Department of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, USA, ⁴Department of Gastroenterology, Takeda Pharmaceuticals, Deerfield, USA

¹Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece, ²Department of Gastroenterology, University Hospital Heraklion, Heraklion, Greece, ³Department of Gastroenterology, Medical School of National and Kapodistrian University -–General Hospital ‘Laiko’, Athens, Greece, ⁴Department of Gastroenterology, Alexandra General Hospital, Athens, Greece, ⁵Department of Gastroenterology, University Hospital Larissa, Larissa, Greece, ⁶Department of Gastroenterology, Sotiria Hospital, Athens, Greece, ⁷Department of Gastroenterology, Tzaneio General Hospital, Piraeus, Greece, ⁸Department of Gastroenterology, Metaxa General Hospital, Piraeus, Greece, ⁹Department of Gastroenterology, Hippokration General Hospital,Thessaloniki, Greece, ¹⁰Department of Surgery, Aretaieion University Hospital, Athens, Greece

¹Department of Internal Medicine, Division of Gastroenterology, selcuk Universitesi Selcuklu Tip Fak, Konya, Turkey, ²Department of Internal Medicine, Selcuk University Medical School, Konya, Turkey

¹Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy, ²Department of Experimental and Clinical Medicine – Florence, University of Florence, Florence, Italy, ³Department of experimental and Clinical Medicine, University of Florence, Fiesole, Italy

¹Bagcilar Education and Research Hospital, Gastroenterology, Istanbul, Turkey, ²Bagcilar Education and Research Hospital, Internal Medicine, Istanbul, Turkey, ³Sisli Education and Research Hospital, Radiology, Istanbul, Turkey, ⁴School of Nursing, Halic University, Istanbul, Turkey, ⁵Okmeydani Education and Research Hospital, Internal Medicine, Istanbul, Turkey, ⁶Faculty of Medicine, Gastroenterology, Mersin University, Istanbul, Turkey

¹Department of Gastroenterology, John Hunter Hospital, Newcastle, Australia, ²Department of Clinical Trials, Robarts Clinical Trials Inc., London, Canada, ³Department of Gastroenterology, The Queen Elizabeth Hospital, Adelaide, Australia

¹Unit for Clinical Nutrition, Department of Gastroenterology and Hepatology, Zagreb, Croatia, ²Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia, ³Department of Gastroenterology and Hepatology, Clinical Hospital Centre Zagreb, Zagreb, Croatia, ⁴Zagreb School of Medicine, University of Zagreb, Zagreb, Croatia

¹Complejo Hospitalario Universitario de Ferrol, Gastroenterology, Ferrol, Spain, ²Complejo Hospitalario Universitario de Ferrol, Dermatology, Ferrol, Spain

¹Departmeng of Gastroenterology, Guy’s and St Thomas’ NHS Foundation Trust, London, UK, ²Viapath Laboratories, Guy’s and St Thomas’ NHS Foundation Trust, London, UK

¹Faculty of Medicine of Tunis, Gastroenterology A Rabta, Tunis, Tunisia, ²Rabta, Gastroenterology A, Tunis, Tunisia

¹Cogentia Healthcare Consulting, n/a, Cambridge, UK, ²Department of Medicine, University of Cambridge, Cambridge, UK, ³Department of Medical Affairs, PredictImmune Limited, Cambridge, UK