¹Cleveland Clinic, Colon and Rectal Surgery, Cleveland, USA, ²Cleveland Clinic, Gastroenterology, Hepatology, and Nutrition, Cleveland, USA

¹Amsterdam University Medical Centres, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ²Shire, Basingstoke, UK, ³Brigham and Women's Hospital and Harvard Medical School, Department of Pathology, Boston, USA, ⁴KU Leuven, Leuven, Belgium, ⁵University of Chicago Medicine, Inflammatory Bowel Disease Centre, Chicago, IL, USA

¹GoodGut SL, Girona, Spain, ²Universitat de Girona, Microbiology, Girona, Spain, ³Institut de Investigació Biomèdica de Girona, Girona, Spain, ⁴Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Spain, ⁵Hospital Universitari Germans Trias I Pujol, CIBEREHD, Badalona, Spain, ⁶Hospital Universitari Dr. Josep Trueta, Girona, Spain, ⁷Hospital de Santa Caterina, Salt, Spain

¹University Hospital Estaing, IBD unit, Clermont-Ferrand, France, ²University Hospital Estaing, Radiology department, Clermont-Ferrand, France

¹University of Birmingham, Institute of Immunology and Immunotherapy, Birmingham, UK, ²University of Calgary, IBD Unit, Calgary, Canada, ³University of Birmingham, Institute of Translational Medicine, Birmingham, UK, ⁴National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, Birmingham, UK, ⁵University of Calgary, Department of Pathology, Calgary, Canada, ⁶University of Calgary, Research Unit, Calgary, Canada, ⁷University of Calgary, IBD Unit, Birmingham, UK, ⁸HSK Hospital, Division of Gastroenterology, Wiesbaden, Germany

¹Erasmus Medical Center – Sophia Children's Hospital, Paediatric Gastroenterology, Rotterdam, The Netherlands, ²Centre for Immunobiology, Blizard Institute, Barts and the London School of Medicine, Queen Mary University of London, Paediatric Gastroenterology, London, UK, ³Université Paris Descartes, Sorbonne Paris Cité, APHP, Hôpital Necker Enfants Malades, Paediatric Gastroenterology, Paris, France

¹University Medical Center Groningen, Gastroenterology and Hepatology, Groningen, The Netherlands, ²University Medical Center Groningen, Laboratory Medicine, Groningen, The Netherlands, ³University Medical Center Groningen, Pathology and Medical Biology, Groningen, The Netherlands

¹University Hospital Estaing, IBD Unit, Clermont-Ferrand, France, ²CHU Bordeaux, Bordeaux, France, ³HCL Lyon-Sud, Lyon, France, ⁴CHU Nice, Nice, France, ⁵CHU Amiens, Amiens, France, ⁶CHU Lille, Lille, France, ⁷CHU Saint-Etienne, Saint-Etienne, France, ⁸CHU Nancy, Nancy, France, ⁹University Hospital Estaing, Biochemistry Lab, Clermont-Ferrand, France

¹Interdisciplinary Crohn Colitis Centre Rhein-Main, Frankfurt/Main, Germany, ²DGD Clinics Sachsenhausen, Frankfurt/Main, Germany, ³Hacettepe University, Ankara, Turkey, ⁴Immundiagnostik AG, Bensheim, Germany, ⁵Agaplesion Markuskrankenhaus, Frankfurt/Main, Germany

¹Aster CMI Hospital, Department of Gastroenterology, Liver Diseases and Clinical Nutrition, Bangalore, India

¹Shaare Zedek Medical Center, Jerusalem, Israel, ²Schneider Medical Center, Petach Tikva, Israel, ³Hospital for Sick Kids, Toronto, Canada

¹Gastroenterology, School of Medicine Federico II of Naples, Naples, Italy, ²Surgical Endoscopy, School of Medicine Federico II of Naples, Naples, Italy

¹La Paz Hospital, Gastroenterology, Madrid, Spain

¹Puerta de Hierro University Hospital, Gastroenterology Department, Madrid, Spain, ²Puerta de Hierro University Hospital, Pathology Department, Madrid, Spain

¹Queen Elizabeth Hospital, University Hospital Birmingham, Department of Gastroenterology, Birmingham, UK

¹Hospital da Senhora da Oliveira, Guimarães, Gastroenterology, Guimarães, Portugal, ²School of Medicine, University of Minho, Braga, Portugal, ³ICVS/3B’s Associate Laboratory, University of Minho, Braga/Guimarães, Portugal

¹Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands, ²University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK, ³University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK, ⁴The Royal Wolverhampton NHS Trust, Wolverhampton, UK, ⁵The Dudley Group NHS Foundation Trust, Dudley, UK, ⁶University Hospitals Birmingham NHS Foundation Trust, NIHR Biomedical Research Centre, University of Birmingham, Birmingham, UK

¹Research Insitute of the McGill University Health Centre, Gastroenterology, Montreal, Canada, ²Sheba Medical Center, Gastroenterology, Ramat Gan, Israel, ³Princess Alexandra Hospital, Gastroenterology and Hepatology, Brisbane, Australia

¹Università Campus Bio-medico di Roma, Gastroenterology, Rome, Italy

¹Moscow Clinical Scientific Center named after A. S. Loginov, Department of inflammatory bowel diseases, Moscow, Russian Federation, ²Moscow Clinical Scientific Center named after A. S. Loginov, Department of Hematology, Moscow, Russian Federation, ³Moscow Clinical Scientific Center named after A. S. Loginov, Department of anesthesiology and resuscitation, Moscow, Russian Federation, ⁴Moscow Clinical Scientific Center named after A. S. Loginov, Department of laboratory diagnostics, Moscow, Russian Federation