¹Wilhelmina Children's Hospital, Pediatric Gastro-enterology, Utrecht, The Netherlands, ²Erasmus MC-Sophia, Pediatric Gastro-enterology, Rotterdam, The Netherlands, ³Sanquin Diagnostic Services, Biologics Lab, Amsterdam, The Netherlands

¹Abpro Corp., Woburn, USA, ²Takeda Pharmaceuticals, Cambridge, USA

¹Sant'Orsola Hospital, Alma Mater Studiorum University of Bologna, Department of Medical and Surgical Sciences, Bologna, Italy

¹Hospital Sant Joan de Déu Althaia - Manresa, Gastroenterology, Manresa- Barcelona, Spain, ²Hospital Mútua de Terrassa, Gastroenterology, Terrassa- Barcelona, Spain, ³Hospital Arnau de Vilanova, Gastroenterology, Lleida, Spain, ⁴Hospital Clínic de Barcelona, Gastroenterology, Barcelona, Spain, ⁵Hospital Universitario de la Princesa, Gastroenterology, Madrid, Spain, ⁶Hospital La Paz, Gastroenterology, Madrid, Spain, ⁷HGU de Elche, Gastroenterology, Elche- Alicante, Spain, ⁸Hospital Clínico Universitario Lozano Blesa, Gastroenterology, Zaragoza, Spain, ⁹Hospital de Galdakao, Gastroenterology, Galdakao-Vizcaya, Spain, ¹⁰HU Salamanca, Gastroenterology, Salamanca, Spain, ¹¹Hospital San Jorge, Gastroenterology, Huesca, Spain, ¹²Hospital Reina Sofía, Gastroenterology, Córdoba, Spain, ¹³Hospital dr. Josep Trueta, Gastroenterology, Girona, Spain, ¹⁴HGU Alicante, Gastroenterology, Alicante, Spain, ¹⁵Hospital Germans Trias i Pujol, Gastroenterology, Barcelona, Spain, ¹⁶Hospital Ramón y Cajal, Gastroenterology, Madrid, Spain, ¹⁷Hospital Clínico San Carlos, Gastroenterology, Madrid, Spain, ¹⁸Hospital La Fe, Gastroenterology, Valencia, Spain, ¹⁹Hospital de Bellvitge, Gastroenterology, Barcelona, Spain, ²⁰Hospital Parc Taulí, Gastroenterology, Sabadell-Barcelona, Spain, ²¹Hospital Clínico, Gastroenterology, Valencia, Spain, ²²Hospital Son Llàtzer, Gastroenterology, Mallorca, Spain, ²³Hospital de Santiago, Gastroenterology, Santiago de Compostela, Spain, ²⁴Hospital de la Santa Creu i Sant Pau, Gastroenterology, Barcelona, Spain, ²⁵Complejo Hospitalario de Burgos, Gastroenterology, Burgos, Spain, ²⁶Complejo Hospitalario de Navarra, Gastroenterology, Pamplona, Spain, ²⁷Hospital Río Hortega, Gastroenterology, Valladolid, Spain, ²⁸Hospital de Torrejón, Gastroenterology, Torrrejón-Madrid, Spain, ²⁹HU Miguel Servet, Gastroenterology, Zaragoza, Spain, ³⁰Consorci Sanitari Mútua de Terrassa, Gastroenterology, Terrassa-Barcelona, Spain, ³¹Hospital de Basurto, Gastroenterology, Basurto-Bilbao, Spain, ³²Hospital Viladecans, Gastroenterology, Viladecans-Barcelona, Spain, ³³HU de Fuenlabrada, Gastroenterology, Fuenlabrada-Madrid, Spain, ³⁴Hospital 12 de Octubre, Gastroenterology, Madrid, Spain, ³⁵Hospital Nuestra Señora de la Candelaria, Gastroenterology, Santa Cruz de Tenerife, Spain, ³⁶Hospital Clínico, Gastroenterology, Valladolid, Spain, ³⁷Hospital General Universitario, Gastroenterology, Valencia, Spain, ³⁸Hospital de Donostia, Gastroenterology, Donostia, Spain, ³⁹Hospital General, Gastroenterology, Ciudad Real, Spain, ⁴⁰Hospital General, Gastroenterology, Castelló, Spain, ⁴¹Hospital Marqués de Valdecilla, Gastroenterology, Santander, Spain, ⁴²HU de Álava, Gastroenterology, Álava, Spain, ⁴³Hospital Infanta Sofía, Gastroenterology, Madrid, Spain, ⁴⁴HU Central de Asturias, Gastroenterology, Oviedo, Spain, ⁴⁵Hospital General de Tomelloso, Gastroenterology, Tomelloso-Ciudad Real, Spain, ⁴⁶Hospital de Cruces, Gastroenterology, Barakaldo-Bilbao, Spain, ⁴⁷Hospital de Segovia, Gastroenterology, Segovia, Spain, ⁴⁸HU Puerta de Hierro, Gastroenterology, Majadahonda-Madrid, Spain, ⁴⁹Hospital General de Granollers, Gastroenterology, Granollers-Barcelona, Spain

¹University of Naples, Translational Medical Science, Section of Pediatrics, Naples, Italy, ²Children Hospital of Philadelphia, Gastroenterology, Hepatology and Nutrition Division, Philadelphia, USA

¹University of Missouri – Kansas City School of Pharmacy, Kansas City, USA, ²AbbVie, Chicago, USA, ³Analysis Group, Boston, USA

¹Erasmus Mc-Sophia Children's Hospital, Rotterdam, The Netherlands, ²Icahn School of Medicine, Mount Sinai, New York, USA, ³Janssen Scientific Affairs, LLC, Horsham, USA, ⁴Janssen Research and Development, LLC, Spring House, USA, ⁵The Hospital for Sick Children, University of Toronto, Toronto, Canada

¹County Durham and Darlington NHS Foundation Trust, Gastroenterology, Durham, UK, ²Hull Royal Infirmary, Gastroenterology, Hull, UK

¹University Medical Center Utrecht, Utrecht, The Netherlands

¹GlaxoSmithKline, Clinical Pharmacology and Experimental Medicine, Stevenage, UK, ²PAREXEL International, Berlin, Germany, ³PAREXEL International, London, UK, ⁴Institute of Clinical Chemistry and Clinical Pharmacology, Study Center Bonn (SZB), Bonn, Germany, ⁵GlaxoSmithKline, Stevenage, UK, ⁶GlaxoSmithKline, Upper Providence, USA, ⁷TxCell S.A., Valbonne, France, ⁸IMED Biotech, AstraZeneca, Cambridge, UK

¹Hospital Santa Maria, CHLN, Gastrenterology, Lisbon, Portugal

¹Great Ormond Street Hospital, Gastroenterology, London, UK, ²University College London Hospital, Gastroenterology, London, UK

¹McGill University Health Center, Division of Gastroenterology, Montreal, Canada, ²Semmelweis University, First Department of Internal Medicine, Budapest, Hungary, ³Geneva’s University Hospitals and University of Geneva, Division of Gastroenterology and Hepatology, Geneva, Switzerland

¹Internistische Gemeinschaftspraxis für Verdauungs- und Stoffwechselkrankheiten Leipzig und Schkeuditz, Leipzig, Germany, ²Praxis Gruemmer, Potsdam, Germany, ³Magen Darm Zentrum, Remscheid, Germany, ⁴MVZ für Gastroenterologie am Bayerischen Platz, Berlin, Germany, ⁵Gastroenterologische Gemeinschaftspraxis am Germania-Campus, Muenster, Germany, ⁶MSD Merck Sharp and Dohme AG, Global Medical Affairs, Kriens, Switzerland, ⁷MSD Sharp and Dohme GmbH, Medical Affairs, Haar, Germany

¹University Medical Centre Utrecht, Department of Gastroenterology and Hepatology, Utrecht, The Netherlands, ²University Medical Centre Utrecht, Laboratory for Translational Immunology, Utrecht, The Netherlands, ³University Medical Centre Utrecht, Julius Centre for Health Sciences and Primary Care, Utrecht, The Netherlands, ⁴Tergooi hospitals, Department of Gastroenterology and Hepatology, Blaricum/Hilversum, The Netherlands, ⁵AZ Delta, Department of Gastroenterology, Roeselare, Belgium, ⁶Hôpital Haut-Lévêque, Service d'Hépato-gastroentérologie et Oncologie Digestive, Bordeaux, France, ⁷Imelda General Hospital, IBD Clinic, Bonheiden, Belgium, ⁸Beaujon Hospital, APHP, Paris Diderot University, Department of Gastroenterology, Clichy, France, ⁹Estaing University Hospital, Department of Gastroenterology, Clermont-Ferrand, France, ¹⁰AZ Damiaan, Department of Gastroenterology, Oostende, Belgium, ¹¹Liège University Hospital CHU, Department of Gastroenterology, Liège, Belgium, ¹²Huriez Hospital, Lille 2 University, Department of Gastroenterology, Lille, France, ¹³Maastricht University Medical Centre, Department of Gastroenterology and Hepatology, Maastricht, The Netherlands, ¹⁴Erasmus Medical Centre, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands, ¹⁵Amsterdam UMC, University of Amsterdam, Department of Gastroenterology, Amsterdam, The Netherlands, ¹⁶University Hospitals Leuven, Department of Gastroenterology and Hepathology, Leuven, Belgium

¹University Hospital of Ioannina, Division of Gastroenterology, Ioannnina, Greece, ²University Hospital of Ioannina, Universital Eye Clinic, Ioannnina, Greece

¹Hannover Medical School (MHH), Gastroenterology, Hepatology and Endocrinology, Hannover, Germany, ²Hannover Medical School (MHH), Institute for Sports Medicine, Hannover, Germany

¹Hospital Universitario y Politécnico La Fe, Gastroenterology, Valencia, Spain, ²Hospital Universitario y Politécnico La Fe, Pharmacy, Valencia, Spain

¹Erasmus MC-Sophia Children’s Hospital, Paediatric Gastroenterology, Rotterdam, The Netherlands, ²Erasmus MC-Sophia Children’s Hospital, Department of Child and Adolescent Psychiatry/Psychology, Rotterdam, The Netherlands, ³Erasmus MC, Department of Biostatistics, Rotterdam, The Netherlands, ⁴Erasmus MC, Department of Gastroenterology, Rotterdam, The Netherlands, ⁵Haga Hospital, Department of Gastroenterology, The Hague, The Netherlands, ⁶Juliana Children’s Hospital, Department of Paediatrics, The Hague, The Netherlands, ⁷Albert Schweitzer Hospital, Department of Paediatrics, Dordrecht, The Netherlands, ⁸University of Amsterdam, Research Institute of Child Development and Education, Amsterdam, The Netherlands, ⁹Academic Center for Child Psychiatry the Bascule, Department of Child and Adolescent Psychiatry, Amsterdam, The Netherlands

¹University of Pavia, Pavia, Italy, ²The Edinburgh IBD Unit, Western General Hospital, Edinburgh, UK