¹IBD Center Humanitas Clinical and Research Centre, Rozzano, Milan, Italy, ²St Mark's Hospital, Harrow, UK, ³Department of Medicine I, Agaplesion Markus Hospital, Goethe-University, Frankfurt am Main, Germany, ⁴CHU de Liège, Liège, Belgium, ⁵Academic Medical Centre, Amsterdam, The Netherlands, ⁶Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel, ⁷The Sackler Faculty of Medicine Tel Aviv University, Tel Aviv, Israel, ⁸Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland, ⁹Global Medical Affairs Gastroenterology, Ferring Pharmaceuticals Center S.A, Saint-Prex, Switzerland, ¹⁰Department of Gastroenterology and Inserm u954, Lorraine University, Nancy, France

¹IBD Unit, Hull & East Yorkshire Hospitals NHS Trust, Hull, UK, ²Hull York Medical School, University of Hull and York, Hull, UK, ³Nottingham University Hospitals NHS Trust, Nottingham, UK, ⁴South Eastern Trust, Belfast, UK, ⁵Royal Shrewsbury Hospitals NHS Trust, Shrewsbury, UK, ⁶Pennine Acute Hospitals NHS Trust, Manchester, UK, ⁷County Durham and Darlington NHS Foundation Trust, Durham, UK, ⁸Colchester Hospital University Foundation Trust, Colchester, UK, ⁹Royal Liverpool and Broadgreen University Hospitals NHS Trust, Liverpool, UK, ¹⁰Airedale NHS Foundation Trust, Airedale, UK, ¹¹Sheffield Teaching Hospitals NHS Trust, Sheffield, UK, ¹²Royal London Hospital, Barts Health NHS Trust, London, UK, ¹³Addenbrookes Hospital, University of Cambridge, Cambridge, UK, ¹⁴Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK

¹Erasmus MC-Sophia Children’s Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands, ²GI Care for Kids and Emory University Hospital, Atlanta, USA, ³Janssen Scientific Affairs, LLC, Horsham, USA, ⁴Janssen Pharmaceuticals, Horsham, USA, ⁵Janssen Research and Development, LLC, Spring House, USA, ⁶Sapienza University of Rome, Rome, Italy

¹Isarklinikum München, Gastroenterology, Munich, Germany, ²IBD center Munich, Munich, Germany, ³Gastroklinik Pasing, Munich, Germany

¹University Hospital Southampton, Gastroenterology, Southampton, UK, ²University of Southampton, NIHR Southampton Biomedical Research Centre, Southampton, UK, ³University of Southampton, Faculty of Medicine, Southampton, UK

¹University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium, ²KU Leuven, Department of Chronic Diseases, Metabolism and Ageing, Translational Research Center for Gastrointestinal Disorders (TARGID), Leuven, Belgium, ³KU Leuven, Department of Human genetics, Laboratory for Complex Genetics, Leuven, Belgium, ⁴Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven, Belgium, ⁵KU Leuven, Department of Microbiology and Immunology, Laboratory of Clinical Immunology, Leuven, Belgium

¹Hospital de Santa Maria, Gastroenterology, Lisbon, Portugal

¹Juntendo University, Gastroenterology, Tokyo, Japan, ²Juntendo Urayasu Hospital, Gastroenterology, Urayasu, Japan

¹Boston Medical Center, Section of Gastroenterology, Boston University School of Medicine, Boston, MA, USA, ²Cajuru University Hospital, Pontifical Catholic University of Paraná (PUCPR), IBD Outpatient Clinics, Colorectal Surgery Unit, Curitiba, Brazil, ³Monash Health, Department of Gastroenterology, Melbourne, VIC, Australia, ⁴Monash University, School of Clinical Sciences at Monash Health, Melbourne, VIC, Australia, ⁵Pfizer Inc., Collegeville, PA, USA

¹LUMC, Gastroenterology-Hepatology, Leiden, The Netherlands, ³National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Birmingham, UK, ⁴University Hospitals Birmingham, Birmingham, UK, ⁵University of Birmingham, Institute of Immunology and Immunotherapy, Birmingham, UK, ⁶University of Birmingham, Institute of Applied Health Research, Birmingham, UK, ⁷LUMC, Department of Biomedical Data Sciences, Leiden, The Netherlands

¹Luigi Sacco University Hospital, General Surgery, Milano, Italy, ²Hôpiteau de Paris (AP-HP), Beaujon Hospital, University Denis Diderot, Department of Colorectal Surgery, Pôle des Maladies de l'Appareil Digestif (PMAD),, Paris, France, ³Luigi Sacco University Hospital, Gastroenterology, Milano, Italy, ⁴ICS Maugeri, General Surgery Department, Pavia, Italy

¹Virgen Macarena Hospital, Gastroenterology, Seville, Spain, ²Virgen Macarena Hospital, Pharmacy Unit, Seville, Spain, ³University of Seville, Seville, Spain, ⁴Virgen Macarena Hospital, Preventive Medicine and Public Health, Seville, Spain, ⁵Virgen Macarena Hospital, Statistics, Seville, Spain

¹Theagenion CHT, Gastroenterology Department, Thessaloniki, Greece

¹Great Ormond Street Hospital, Gastroenterology, London, UK

¹Sahloul Sousse, Gastroenterology, Sousse, Tunisia, ²Sahloul Sousse, Sousse, Tunisia

¹Steel Memorial Yawata Hospital, Department of Gastroenterology, Fukuoka, Japan, ²Kyushu University, Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Fukuoka, Japan, ³Saga University Hospital, Department of Endoscopy, Saga, Japan

¹Connolly Hospital, Blanchardstown, Department of Gastroenterology, Dublin, Ireland

¹Sint Antonius Teaching Hospital, Gastroenterology, Nieuwegein, The Netherlands, ²University Medical Center Utrecht, Gastroenterology, Utrecht, The Netherlands, ³Sint Antonius Teaching Hospital, Hematology, Nieuwegein, The Netherlands, ⁴University Medical Center Utrecht, Pediatrics, Laboratory of Translational Immunology, Utrecht, The Netherlands

¹Charité - Universitätsmedizin Berlin, Department of Gastroenterology, Rheumatology and Infectious Disease, Campus Benjamin Franklin, Berlin, Germany, ²Charité – Universitätsmedizin Berlin, Laboratory of Molecular Psychiatry and Department of Neuropsychiatry, DZNE Berlin, Berlin, Germany, ³Berlin Institute of Health, Berlin, Germany

¹St. James Hospital, Gastroenterology, Dublin, Ireland, ²St. James Hospital, Biochemistry, Dublin, Ireland