Evelina London Children's Hospital, London, UK

¹UOC Gastroenterologia ASST Monza Ospedale San Gerardo - International Center for Digestive Health University of Milan Bicocca, UOC Gastroenterologia ASST Monza, Monza, Italy, ²San Paolo Hospital ASST Santi Paolo e Carlo, UO Medicina VI Hepatology and Gastroenterology, Milano, Italy, ³San Giuseppe Hospital, Division of Gastroenterology, Milano, Italy, ⁴Valduce Hospital, Division of Gastroenterology, Como, Italy

“Dana-Dwek” Children's Hospital, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, The Pediatric Gastroenterology Unit, Tel Aviv, Israel

Fondazione Policlinico Gemelli, Rome, Italy

¹University of Verona, Department of Medicine, Verona, Italy, ²Fondazione IRCCS Policlinico San Matteo, Pavia, Italy, ³Takeda Pharmaceutical Company Limited, Boston, USA, ⁴Fondazione IRCCS Policlinico San Matteo, Department of Clinical Medicine I, Pavia, Italy

University Paediatric Hospital “Prof. Ivan Mitev”, Gastroenterology and Hepatology, Sofia, Bulgaria

Policlinico Sant'Orsola Malpighi, Bologna, Italy

¹''Sf Spiridon'' County Clinical Emergency Hospital, Gastroenterology, Iasi, Romania, ²''Grigore T. Popa'' University of Medicine and Pharmacy, Iasi, Romania

National Taiwan University Hospital and College of Medicine, Department of Internal Medicine, Taipei, Taiwan

¹Complejo Hospitalario Universitario de Santiago, Gastroenterology Unit, Santiago de Compostela, Spain, ²Hospital Universitario Reina Sofia, Unidad Clinica de Aparato Digestivo, Cordoba, Spain, ³Hospital General Universitario Alicante, Gastroenterology unit, Alicante, Spain, ⁴Hospital Universitario La Paz, Gastroenterology Unit, Madrid, Spain, ⁵Servicio de Gastroenterologia, Hospital La Fe, Valencia, Spain, ⁶Hospital Clinico San Carlos, Gastroenterology Unit, Madrid, Spain, ⁷MSD Spain, Medical Department, Madrid, Spain, ⁸Hospital Universitari Germans Trias i Pujol and CIBERehd, Gastroenterology Unit, Badalona, Spain

UMC Utrecht, Gastroenterology, Utrecht, The Netherlands

¹Hospital de Clínicas, Gastroenterology, Montevideo, Uruguay, ²Hospital de Clnicas, Metodos, Montevideo, Uruguay, ³Grupo Uruguayo de Trabajo en Enfermedad Inflamatoria IntestinalL, Montevideo, Uruguay

¹Royal London Hospital, Gastroenterology, London, UK, ²Barth Health, London, UK, ³The Blizard Institute, Centre for Immunology, Barts and the London School of Medicine, London, UK

¹Academic Medical Center (AMC), Hospital Pharmacy, Amsterdam, The Netherlands, ²Academic Medical Center (AMC), Gastroenterology and Hepatology, Amsterdam, The Netherlands, ³Onze Lieve Vrouwe Gasthuis, Gastroenterology and Hepatology, Amsterdam, The Netherlands, ⁴VU University Medical Center, Gastroenterology and Hepatology, Amsterdam, The Netherlands

¹Faculty of Medicine, Autonomous University of Madrid, Department of Surgery, Madrid, Spain, ²Hospital Clínic de Barcelona, IDIBAPS, CIBERehd, Gastroenterology Department, Barcelona, Spain, ³Takeda Pharmaceuticals International, London, UK, ⁴TiGenix S.A.U., Tres Cantos, Madrid, Spain, ⁵Takeda Pharmaceuticals International AG, Zurich, Switzerland

¹Icahn School of Medicine at Mount Sinai, New York, USA, ²NOVEL Health Strategies, Bethesda, USA, ³AbbVie Inc., North Chicago, USA

¹John Radcliffe Hospital, Translational Gastroenterology Unit, Oxford, UK, ²Mathematical Institute, Oxford, UK, ³Big Data Institute, Oxford, UK, ⁴University of Oxford, Psychiatry Department, Oxford, UK, ⁵University of Oxford, Nuffield Department of Population Health, Oxford, UK, ⁶University of Oxford, Centre for Statistics in Medicine, Oxford, UK

¹Semmelweis University, First Department of Medicine, Budapest, Hungary, ²University of Szeged, First Department of Internal Medicine, Szeged, Hungary, ³Military Hospital – State Health Centre, Gastroenterology Unit, Budapest, Hungary, ⁴University of Pécs, 1st Department of Medicine, Pecs, Hungary, ⁵Mcgill University Health Center, Department of Gastroenterology, Montreal, Canada

¹Medical University of Vienna, Department of Internal Medicine III, Vienna, Austria, ²Medical University of Innsbruck, Department of Internal Medicine I, Innsbruck, Austria, ³Medical University of Graz, Department of Gastroenterology and Hepatology, Graz, Austria, ⁴Universitätsklinikum St. Pölten, Department of Internal Medicine II, St. Pölten, Austria, ⁵Darmpraxis Salzburg, Salzburg, Austria, ⁶Hospital Hall in Tirol, Department of Internal Medicine, Hall in Tirol, Austria, ⁷Hospital Rudolfstiftung, Department of Internal Medicine IV, Vienna, Austria, ⁸Hospital Elisabethinen Linz, Department of Internal Medicine IV, Linz, Austria, ⁹Hospital Wels-Grieskirchen, Department of Internal Medicine I, Wels, Austria, ¹⁰Hospital Barmherzige Brüder Salzburg, Department of Internal Medicine, Salzburg, Austria, ¹¹Hospital Wiener Neustadt, Department of Internal Medicine I, Wiener Neustadt, Austria, ¹²Hartmannspital, Department of Internal Medicine, Vienna, Austria, ¹³Danube Hospital, Department of Internal Medicine 2, Vienna, Austria, ¹⁴Wilheminenspital der Stadt Wien, Department of Internal Medicine 4, Vienna, Austria, ¹⁵Medical University of Vienna, Department of Emergency Medicine, Vienna, Austria

¹Ramon y Cajal, Gastroenterology and Hepatology, Madrid, Spain, ²Ramon y Cajal, Inmunology, Madrid, Spain, ³Ramon y Cajal, Microbiology, Madrid, Spain