¹Immundiagnostik AG, Bensheim, Germany, ²Agaplesion Markus Krankenhaus, Department of Gastroenterology, Frankfurt/Main, Germany, ³Interdisciplinary Crohn Colitis Centre Rhein-Main, Frankfurt/Main, Germany, ⁴DGD Clinics Sachsenhausen, Frankfurt/Main, Germany

¹Tillotts Pharma AG, Rheinfelden, Switzerland, ²Kantar Health, Paris, France

¹Mayo Clinic, Colon and Rectal Surgery, Rochester, USA, ²Humanitas Clinical Institute, Colon and Rectal Surgery, Milan, Italy, ³St Marks Hospital, Colon and Rectal Surgery, London, UK, ⁴Cedars-Sinai Los Angeles, Colon and Rectal Surgery, Los Angeles, USA

Coimbra Hospital and University Center, Gastroenterology, Coimbra, Portugal

¹Royal Adelaide Hospital, Department of Gastroenterology, Adelaide, Australia, ²Royal Adelaide Hospital, Department of General Medicine, Adelaide, Australia, ³Royal Adelaide Hospital, Department of Psychology, Adelaide, Australia, ⁴University of Adelaide, Adelaide, Australia, ⁵Deakin University, Melbourne, Australia

¹University of Helsinki, Helsinki, Finland, ²Helsinki University Hospital, Gastroenterology, Helsinki, Finland, ³United Medix Laboratories, Helsinki, Finland

¹CHU Liège, Gastroenterology, Liège, Belgium, ²ULB Erasme, Brussels, Belgium, ³UCL, Brussels, Belgium, ⁴⁴Centre Hospitalier Jolimont, Haine-Saint-Paul, Belgium, ⁵Algemeen Ziekenhuis Groeninge, Kortrijk, Belgium, ⁶Imelda GI Clinical Research Centre, Keerbergen, Belgium, ⁷Centre Hospitalier Universitaire Saint-Pierre, Brussels, Belgium, ⁸Takeda Belgium, Brussels, Belgium, ⁹Algemeen Ziekenhuis Sint-Lucas Brugge vzw, Brugge, Belgium

¹Academic Medical Center, Gastroenterology and Hepatology, Amsterdam, The Netherlands, ²Albert Schweitzer Hospital, Department of Gastroenterology and Hepatology, Dordrecht, The Netherlands, ³Mundipharma Pharmaceuticals BV, Hoevelaken, The Netherlands, ⁴Amsterdam Rheumatology and Immunology Center, Amsterdam, The Netherlands, ⁵Imelda hospital, Bonheiden, Belgium, ⁶Amphia Hospital Breda Loc. Langendijk, Breda, The Netherlands, ⁷Academic Medical Center (AMC), Tytgat Institute for Intestinal and Liver Research, Amsterdam, The Netherlands

¹Imperial College London, Department of Surgery and Cancer, London, UK, ²St Mark's Hospital and Academic Institute, Surgical Epidemiology Trials and Outcome Centre, London, UK, ³St Mark's Hospital and Academic Institute, London, UK

¹University of Padua, Gastroenterology, Padova, Italy, ²University of Padua, Gastroenterologia, Padova, Italy

¹Hôpital Saint-Louis, APHP, INSERM UMRS 1160, Université Denis Diderot, Gastroenterology and Hepatology, Paris, France, ²Takeda Pharmaceuticals International AG, Zurich, Switzerland, ³Gastro-entérologie La Source-Beaulieu and Division of Gastroenterology, Centre Hospitalier Universitaire Vaudois, Crohn’s and Colitis Center, Lausanne, Switzerland

¹Montpellier University Hospital, Gastroenterology, Montpellier, France, ²Henri-Mondor University Hospital, Gastroenterology, Creteil, France, ³Rennes University Hospital, Gastroenterology, Rennes, France, ⁴Caen University Hospital, Gastroenterology, Caen, France, ⁵Liège University Hospital, Gastroenterology, Liège, Belgium, ⁶APHP Paris Sud University , Gastroenterology, Le Kremlin Bicêtre, France, ⁷Amiens University Hospital, Gastroenterology, Amiens, France, ⁸Bordeaux University Hospital, Gastroenterology, Bordeaux, France, ⁹Rouen University Hospital, Gastroenterology, Rouen, France, ¹⁰Clermont-Ferrand University Hospital, Gastroenterology, Clermont-Ferrand, France, ¹¹Cochin University Hospital, Gastroenterology, Paris, France, ¹²Beaujon University Hospital, Gastroenterology, Paris, France, ¹³Saint-Antoine University Hospital, Gastroenterology, Paris, France, ¹⁴Lyon University Hospital, Gastroenterology, Lyon, France, ¹⁵Lille University Hospital, Gastroenterology, Lille, France, ¹⁶Nancy University Hospital, Gastroenterology, Nancy, France

¹Department of Gastroenterology, King's College Hospital NHS Foundation Trust, London, UK, ²Department of Gastroenterology, The Pennine Acute Hospitals NHS Trust, Manchester, UK, ³Manchester Academic Health Sciences Centre, University of Manchester, Manchester, UK, ⁴Department of Gastroenterology, Leeds Teaching Hospitals NHS Trust, Leeds, UK, ⁵Department of Gastroenterology, East Kent Hospital University Foundation Trust, Margate, UK, ⁶Department of Gastroenterology, Maidstone and Tunbridge Wells NHS Trust, Tunbridge Wells, UK

¹Interdisciplinary Crohn Colitis Centre Rhein-Main, Frankfurt/Main, Germany, ²DGD Clinics Sachsenhausen, Frankfurt/Main, Germany, ³Gastroenterological practice, Göppingen, Germany, ⁴Gastroenterological practice, Cottbus, Germany, ⁵Vifor Pharma Deutschland GmbH, Munich, Germany, ⁶Agaplesion Markus Krankenhaus, Department of Gastroenterology, Frankfurt/Main, Germany

¹Faculty of Medicine and Health, Örebro University, Örebro, Sweden, ²Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden

¹LUMC, Gastroenterology-Hepatology, Leiden, The Netherlands, ²Lumc, Geriatrics and Gerontology, Leiden, The Netherlands

Osaka city university, gastroenterology, Osaka, Japan

¹IBD clinical and research centre, Iscare, Prague, Czech Republic, ²Department of Internal medicine, University Hospital Plzen, Plzen, Czech Republic, ³Department of Internal medicine, Thomayer University Hospital, Prague, Czech Republic, ⁴Department of Paediatrics, 2nd Faculty of Medicine, Charles University in Prague and Motol University Hospital, Prague, Czech Republic, ⁵Department of Paediatric Surgery, 2nd Faculty of Medicine, Charles University in Prague and Motol University Hospital, Prague, Czech Republic, ⁶General paediatrician, Prague, Czech Republic

¹University Hospitals Leuven, Leuven, Belgium, ²McMaster University, Hamilton, Ontario, Canada, ³Pfizer, Cambridge, USA, ⁴Shire, Lexington, USA, ⁵Zymo Consulting Group, Newtown Square, USA

Hospital Beatriz Ângelo, Gastroenterology Department, Loures, Portugal