¹Hospital Universitario La Paz, Department of Gastroenterology, Madrid, Spain, ²Hospital Universitario la paz, Radiology, Madrid, Spain, ³Hospital Universitario la paz, Gastroenterology, Madrid, Spain

¹University of Florence, Florence, Italy, ²Division of Gastroenterology, AOU Careggi Hospital, Department of Emergency, Florence, Italy, ³Digestive Surgery Unit, Careggi University Hospital, Department of Surgery and Translational Medicine, Florence, Italy

¹University of Turin, Medical School, Department of Public Health and Pediatric Sciences, Viral Pathogenesis Unit, Turin, Italy, ²University of Piemonte Orientale, Department of Translational Medicine, Virology Unit, Novara, Italy, ³University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium, ⁴Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Leuven, Belgium

¹University of Calgary, Calgary, Canada, ²Friedrich-Alexander-University Erlangen-Nürnberg, Medical Clinic 1, Erlangen, Germany, ³University Hospitals Leuven, Leuven, Belgium, ⁴Icahn School of Medicine at Mount Sinai, New York, USA, ⁵University of Miami, Miami, USA, ⁶AbbVie Inc., North Chicago, USA

¹MassGeneral Hospital for Children, Pediatric Gastroenterology, Boston, USA, ²Harvard Medical School, Boston, USA, ³Cincinnati Children's Hospital, Cincinnati, USA, ⁴Children’s Mercy Hospital, Kansas City, USA, ⁵University of Texas-Southwestern/Children's Medical Center, Dallas, USA, ⁶The Children’s Hospital at Montefiore, Bronx, USA, ⁷Mayo Clinic-Children’s Center, Rochester, USA, ⁸Takeda Pharmaceuticals USA, Deerfield, USA, ⁹University of Vermont College of Medicine, Burlington, USA

¹University Medical Centre Ljubljana, Department of Gastroenterology, Ljubljana, Slovenia, ²KU Leuven, Laboratory of Pharmaceutical Biology, Leuven, Belgium

¹Gastroneterology Unit, Saint Etienne, France, ²University of Saint Etienne, Immunology, Saint Etienne, France, ³University of Lyon, Lyon, France, ⁴University Hospital, Gastroenterology, Saint Etienne, France, ⁵Saint Etienne University, Saint Etienne, France, ⁶CHU Saint Etienne, Saint Etienne, France

¹Università della Campania, Unit of Colorectal Surgery, Naples, Italy, ²St Mark's Hospital, Fistula Research Unit, London, UK, ³Imperial College, Department of Surgery and Cancer, London, UK, ⁴Oxford University Hospital NHS Trust - Churchill Hospital, Department of Colorectal Surgery, Oxford, UK, ⁵Faculty of Medicine, University of Kelaniya, Department of Surgery, Kelaniya, Sri Lanka, ⁶Humanitas University, Colon and Rectal Surgery Unit, Department of General Surgery, Rozzano, Italy, ⁷Humanitas University, Humanitas University, Department of Biomedical Sciences, Rozzano, Italy

¹PHMR Ltd., London, UK, ²Takeda Pharmaceuticals International GmbH, Zurich, Switzerland, ³Takeda UK Ltd., High Wycombe, UK

¹Friedrich-Alexander University Erlangen-Nürnberg, Department of Medicine 1, Erlangen, Germany, ²Friedrich-Alexander University Erlangen-Nürnberg, Department of Medicine 3, Erlangen, Germany, ³Progentica Biopharma, Derio, Spain, ⁴Friedrich-Alexander University Erlangen-Nürnberg, Department of Medical Informatics, Biometry and Epidemiology, Erlangen, Germany

AMAG Pharmaceuticals, Inc., Waltham, USA

¹Hospital Universitari Germans Trias i Pujol, Gastroenterology, Badalona, Barcelona, Spain, ²Hospital Universitari Germans Trias i Pujol, Department of Gastroenterology, Badalona, Barcelona, Spain, ³CIBEREHD, Madrid, Spain, ⁴Hospital Universitari Germans Trias i Pujol, Department of Immunology, Badalona, Barcelona, Spain

¹Stanford Medical Center, Stanford, USA, ²Janssen Research and Development, LLC, Spring House, USA

¹University of Messina, IBD-unit, Department of Clinical and Experimental Medicine, Messina, Italy, ²Catholic University, IBD Unit Complesso Integrato Columbus, Fondazione Policlinico Gemelli, Rome, Italy, ³University of Palermo, "Villa Sofia-Cervello" Hospital, Di.Bi.M.I.S., Division of Internal Medicine, Palermo, Italy, ⁴Humanitas Research Hospital, Rozzano, IBD Center, Department of Gastroenterology, Milan, Italy, ⁵Ospedale Maggiore Policlinico, Milan, Gastroenterology and Endoscopy Unit, Fondazione IRCCS Cà Grande, Milano, Italy, ⁶University of Padua, Gastroenterology Unit, Department of Surgical, Oncological, and Gastroenterological Sciences, Padova, Italy, ⁷IRCCS “Casa Sollievo della Sofferenza”, San Giovanni Rotondo, Division of Gastroenterology, Foggia, Italy, ⁸University of Rome "Tor Vergata", Department of Systems Medicine, Rome, Italy

¹CHU Liège, Liège, Belgium, ²CHU Liège, Gastroenterology, Liège, Belgium

¹IRCSS Casa Sollievo della Sofferenza, Gastroenterology and Digestive Endoscopy Unit, San Giovanni Rotondo, Italy, ²University of Padua, Padua, Italy, ³Sacro Cuore Don Calabria Hospital, Negrar, Italy, ⁴Humanitas Clinical and Research Institute, IBD Center, Department of Gastroenterology, Rozzano, Italy, ⁵Cannizzaro Hospital, Catania, Italy, ⁶Catholic University of Sacred Heart, Internal Medicine and Gastroenterology, Rome, Italy, ⁷Brotzu Hospital, Gastroenterology Unit, Department of Medicine, Cagliari, Italy, ⁸S. Maria del Prato Hospital, Gastroenterology and Digestive Endoscopy Unit, Feltre, Italy, ⁹Humanitas Clinical and Research Institute, Rozzano, Italy, ¹⁰Humanitas University, Biomedical Sciences, Rozzano, Italy

¹ISCARE I.V.F. a.s., IBD Clinical and Research Centre, Prague, Czech Republic, ²1st Medical Faculty, Charles University, Institute of Pharmacology, Prague, Czech Republic, ³Military Hospital, Charles University, Department of Internal Medicine, Prague, Czech Republic, ⁴1st Medical Faculty and General Teaching Hospital, Charles University, Institute of Medical Biochemistry, Prague, Czech Republic

University College London Hospital, Department of Gastroenterology, London, UK

¹DGD Clinics Sachsenhausen, Frankfurt/Main, Germany, ²Interdisciplinary Crohn Colitis Centre Rhein-Main, Frankfurt/Main, Germany, ³Hacettepe University, Faculty of Health Sciences, Ankara, Turkey

¹Department of Gastroenterology and Hepatology, Linköping, Sweden, ²Department of Pathology, Linköping, Sweden, ³Department of Gastroenterology and Hepatology, Linköping, Sweden