¹The Children’s Memorial Health Institute, Department of Gastroenterology, Hepatology, Feeding Disorders and Paediatrics, Warsaw, Poland

¹Icahn School of Medicine at Mount Sinai, Department of Pathology, New York, USA, ²Icahn School of Medicine at Mount Sinai, Department of Medicine, Gastroenterology, New York, USA

¹National Medical Research Center for Children's Health, Gastroenterology and Hepatology, Moscow, Russian Federation, ²National Medical Research Center for Children's Health, Laboratory of Experimental Immunology and Virology, Moscow, Russian Federation, ³Sechenov First Moscow State Medical University, Department of Peliatrics and Rheumatology, Moscow, Russian Federation, ⁴National Medical Research Center for Children's Health, Cytochemical Research Center, Moscow, Russian Federation

¹Erasmus MC, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands, ²Erasmus MC, Department of Biostatistics, Rotterdam, The Netherlands

¹University of Medical Sciences, General, Endocrinological Surgery and Gastrointestinal Oncology, Poznań, Poland, ²University of Medical Sciences, Department of Gastroenterology, Poznan, Poland

¹Yokkaichi Hazu Medical Centre, IBD Centre, Yokkaichi, Japan

¹São Paulo University Medical School, Pediatric, São Paulo, Brazil, ²Hospital Israelita Albert Einstein, GI, São Paulo, Brazil, ³Hospital Israelita Albert Einstein, Surgery, São Paulo, Brazil, ⁴UNIFESP-EPM, GI, SP, Brazil, ⁵Hospital Israelita Albert Einstein, Research, São Paulo, Brazil, ⁶Hospital Israelita Albert Einstein, Oncology-hematology, São Paulo, Brazil

¹Guy's and St.Thomas' NHS Foundation Trust, Nutrition and Dietetics, London, UK, ²King's College London, Nutritional Sciences Division, London, UK, ³Guy's and St. Thomas' NHS Foundation Trust, Colorectal Surgery, London, UK, ⁴Guy's and St. Thomas' NHS Foundation Trust, Gastroenterology, London, UK

¹Multispecialistic Centre for Recto-Perineal Diseases (IBD Unit), Department of Gastroenterology, IRCCS Ospedale Sacro Cuore Don Calabria, Negrar (Verona), Italy

¹Hospital Sykehuset Østfold, Department of Gastroenterology, Sarspborg, Norway, ²Østfold University College, Halden, Norway, ³Hospital Sykehuset Østfold, Department of Research, Sarspborg, Norway

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, Infection department, Moscow, Russian Federation

¹Clinical Center Zvezdara, Department of Gastroenterology, Belgrade, Serbia, ²Institute of Public Health of Belgrade, Health Promotion, Belgrade, Serbia

¹University of Szeged, First Department of Medicine, Szeged, Hungary, ²University of Szeged, Institute of Laboratory Medicine, Szeged, Hungary

¹GI Unit, 3rd Academic Department of Internal Medicine, Athens, Greece, ²General Hospital ‘Laikon’, Neurological Unit,, Athens, Greece, ³Sotiria Hospital, National and Kapodistrian University of Athens, GI-Unit, 3rd Academic Department of Internal Medicine, Athens, Greece

¹University Hospital CHU of Liège, Liège, Belgium, ²University of California San Diego, La Jolla, USA, ³Academic Medical Center, Amsterdam, The Netherlands, ⁴AZ Delta Roeselare-Menen, Menen, Belgium, ⁵AbbVie Deutschland GmbH & Co. KG, Ludwigshafen, Germany, ⁶AbbVie Inc., North Chicago, USA, ⁷University of Western Ontario, Robarts Research Institute, London, Canada

¹University Hospitals Leuven, Leuven, Belgium, ²University Hospital Centre Zagreb, Zagreb, Croatia, ³Kitasato University Kitasato Institute Hospital, Tokyo, Japan, ⁴Takeda Development Center Americas Inc., Cambridge, USA, ⁵Takeda Pharmaceuticals International AG, Zurich, Switzerland, ⁶Takeda Pharmaceuticals International, Deerfield, USA, ⁷University of California - San Diego, La Jolla, USA

¹St Mark's Hospital, Inflammatory Bowel Disease, London, UK, ²University Hospitals Leuven, Gastroenterology and Hepatology, Leuven, Belgium, ³KU Leuven, Chronic Diseases, Metabolism and Ageing, Leuven, Belgium, ⁴Hull and East Yorkshire Hospitals NHS Trust, Inflammatory Bowel Disease Unit, Hull, UK, ⁵University of Hull and York, Hull York Medical School, Hull, UK, ⁶University of Turin, Surgical Sciences, Turin, Italy, ⁷University Hospital Zurich, Medicine, Zurich, Switzerland, ⁸University of Ioannina School of Medical Sciences, Gastroenterology, Ioannina, Greece, ⁹University Hospital Galway, Gastroenterology, Galway, Ireland, ¹⁰Grand Hopital de Charleroi, Gastroenterology and Hepatology, Charleroi, Belgium, ¹¹University Hospital Saint-Luc, Gastroenterology and Hepatology, Bruxelles, Belgium, ¹²Hospital de Clinicas de Porto Alegre, Gastroenterology, Rio Grande do Sul, Brazil, ¹³University Messina, Clinical Unit for Chronic Bowel Disorders, Messina, Italy, ¹⁴University of Parma, Gastroenterology and Endoscopy Unit, Parma, Italy, ¹⁵Sacro Cuore Don Calabria of Negrar, Negrar, Italy, ¹⁶Hannover Medical School, Gastroenterology, Hepatology and Endocrinology, Hannover, Germany, ¹⁷Sheba Medical Centre, Gastroenterology, Ramat Gan, Israel

¹Humanitas University, Milan, Italy, ²Takeda Pharmaceuticals International AG, Zurich, Switzerland, ³Takeda Development Centre Europe Ltd., London, UK, ⁴Takeda Pharmaceuticals International, Deerfield, USA, ⁵Icahn School of Medicine at Mount Sinai, New York, USA

¹Herlev and Gentofte Hospital, Gastroentrology, Copenhagen, Denmark, ²Odense University Hospital, Gastroentrology, Odense, Denmark

¹Western University, London, Ontario, Canada, ²University of California San Diego, La Jolla, CA, USA, ³University Hospital Schleswig-Holstein, Kiel, Germany, ⁴AbbVie Inc., North Chicago, IL, USA, ⁵Amsterdam University Medical Centers, Amsterdam, The Netherlands