¹Kyoto Prefectural University of Medicine, Molecular Gastroenterology and Hepatology, Kyoto, Japan, ²Murakami Memorial Hospital, Asahi University, Department of Gastroenterology, Gifu, Japan

¹The Royal Wolverhampton NHS Trust, Department of Clinical Chemistry, Wolverhampton, UK, ²The Royal Wolverhampton NHS Trust, Department of Gastroenterology, Wolverhampton, UK

¹Hospital Universitario de Canarias, Gastroenterology, La Laguna, Spain, ²Hospital Universitario de Canarias, Pathology, La Laguna, Spain, ³Hospital Universitario de Canarias, Research Unit, La Laguna, Spain, ⁴Universidad de La Laguna, La Laguna, Spain

¹Hospital Universitario de La Princesa, Gastroenterology Unit, Madrid, Spain, ²Instituto de Investigación Sanitaria Princesa (IIS-IP), Madrid, Spain, ³Universidad Autónoma de Madrid, Madrid, Spain, ⁴Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain, ⁵Hospital de Galdakao-Usansolo, Gastroenterology Unit, Vizcaya, Spain, ⁶Hospital Universitario de Gran Canaria Doctor Negrín, Gastroenterology Unit, Las Palmas de Gran Canaria, Spain, ⁷Consorci Sanitari Terrassa, Gastroenterology Unit, Tarrasa, Spain, ⁸Hospital San Pedro, Gastroenterology Unit, Logroño, Spain, ⁹Hospital Clínico Universitario de Santiago, Gastroenterology Unit, Santiago de Compostela, Spain, ¹⁰Hospital Universitario Reina Sofía, Gastroenterology Unit, Córdoba, Spain, ¹¹IMIBIC, Córdoba, Spain, ¹²Hospital Universitario Son Espases, Gastroenterology Unit, Palma de Mallorca, Spain, ¹³Hospital Clínico Universitario Lozano Blesa, Gastroenterology Unit, Zaragoza, Spain, ¹⁴ISS Aragón, Zaragoza, Spain, ¹⁵Hospital General Universitario de Ciudad Real, Gastroenterology Unit, Ciudad Real, Spain, ¹⁶Hospital Universitario y Politécnico de La Fe, Gastroenterology Unit, Valencia, Spain, ¹⁷Hospital Universitario Central de Asturias, Gastroenterology Unit, Oviedo, Spain, ¹⁸Hospital Universitario de Marqués de Valdecilla, Gastroenterology Unit, Santander, Spain, ¹⁹Hospital San Pedro de Alcántara, Gastroenterology Unit, Cáceres, Spain, ²⁰Complejo Hospitalario de Navarra, Gastroenterology Unit, Pamplona, Spain, ²¹Hospital Universitario de Burgos, Gastroenterology Unit, Burgos, Spain, ²²Hospital General Universitario Morales Meseguer, Gastroenterology Unit, Murcia, Spain, ²³Universidad Autónoma de Madrid, Preventive Medicine and Public Health, Madrid, Spain, ²⁴IdiPAZ, Madrid, Spain, ²⁵Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), Madrid, Spain

¹St Mark's Hospital, Colorectal Surgery, London, UK, ²St Mark's Hospital, Gastrointestinal Imaging, London, UK, ³St Mark's Hospital, IBD/Physiology, London, UK

¹Tallaght Hospital, Gastroenterology, Dublin 24, Ireland, ²Talllaght Hospital, Dublin, Ireland, ³Talllaght Hospital, Gastroenterology, Dublin, Ireland, ⁴Adelaide and Meath Hospital, Dublin, Incorporating The National Children's Hospital, Department of Gastroenterology, Dublin, Ireland, ⁵Trinity College Dublin, Dublin, Ireland, ⁶Adelaide and Meath Hospital, Dublin, Incorporating The National Children's Hospital, Department of Radiology, Dublin, Ireland

¹St Vincent's Hospital, Department of Gastroenterology, Melbourne, Australia, ²The University of Melbourne, Parkville, Australia, ³University of Calgary, Department of Gastroenterology, Calgary, Canada

¹King's College London, Florence Nightingale School of Nursing and Midwifery, London, UK, ²St Mark's Hospital, Harrow, London, UK, ³Guy's and St Thomas' NHS Foundation Trust, Department of Gastroenterology, London, UK, ⁴University College Hospital, Gi Division, London, UK, ⁵Queen Mary University London, London, UK, ⁶Queen Mary University London, Pragmatic Clinical Trials Unit, London, UK, ⁷Crohn's and Colitis UK, Department of Policy, Public Affairs, and Research, St Albans, UK, ⁸Patient representative, London, UK, ⁹University of Greenwich, Faculty of Education and Health, London, UK, ¹⁰Bart's Health NHS Trust, Academic Research Centre, London, UK

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

Instituto Português de Oncologia de Lisboa, Francisco Gentil, Lisboa, Portugal

Tokyo Women's Medical University, Institute of Gastroenterology, Tokyo, Japan

¹Nordic Bioscience, Biomarker and Research, Herlev, Denmark, ²Odense University Hospital, Kerteminde, Denmark, ³Lillebaelt Hospital Vejle, Internal Medicine, Section of Gastroenterology, Vejle, Denmark

¹Academic Medical Center, Gastroenterology and Hepatology, Amsterdam, The Netherlands, ²Academic Medical Center, Coronel Institute of Occupational Health, Amsterdam, The Netherlands

¹Pusan National University, Pediatrics, Yansan, South Korea, ²Pusan National University Yangsan Hospital, Pediatrics, Yangsan, South Korea

¹A. Gemelli University Policlinic Foundation - Catholic University of Sacred Heart, Gastroenterological Area, Gastroenterological and Endocrino-Metabolical Sciences Department, Rome, Italy, ²A. Gemelli University Policlinic Foundation - Catholic University of Sacred Heart, Head and Neck Department-Ophthalmology Division, Rome, Italy, ³A. Gemelli University Policlinic Foundation - Catholic University of Sacred Heart, Hospital Nutrition Team, Rome, Italy, ⁴A. Gemelli University Policlinic Foundation - Catholic University of Sacred Heart, IBD Unit, Presidio Columbus, Rome, Italy

¹University of Bologna, Dept of Clinical and Surgical Sciences - IBD Unit, Bologna, Italy, ²IRCCS Policlinico San Donato, Milan, Italy, ³University of Milan, Milan, Italy

¹Reina Sofia University Hospital, Gastroenterology, Córdoba, Spain, ²Reina Sofia University Hospital, Nuclear Medicine, Córdoba, Spain, ³Instituto Maimónides de Investigación Biomédica de Córdoba, Córdoba, Spain

Med Taher Maamouri Hospital, GastroEnterology department, Nabeul, Tunisia

¹Kyung Hee University, School of Medicine, Seoul, South Korea, ²Sungkyunkwan University, School of Medicine, Seoul, South Korea, ³Seoul National University, College of Medicine, Seoul, South Korea, ⁴University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea, ⁵Ewha Womans University, School of Medicine, Seoul, South Korea, ⁶St. Vincent's Hospital, The Catholic University, Seoul, South Korea, ⁷Kangbuk Samsung Hospital Sungkyunkwan University, Department of Internal Medicine, Seoul, South Korea, ⁸Korea University, College of Medicine, Seoul, South Korea, ⁹Eulji University, College of Medicine, Seoul, South Korea, ¹⁰Yonsei University, College of Medicine, Seoul, South Korea, ¹¹Janssen Korea, Medical affairs, Seoul, South Korea

¹Hospital Clínic Barcelona, IDIBAPS, CIBERehd, Barcelona, Spain, ²University of California San Diego, La Jolla, USA, ³Mayo Clinic, Division of Gastroenterology and Hepatology, Rochester, USA, ⁴University Hospitals Leuven, Leuven, Belgium, ⁵University of Birmingham, Birmingham, UK, ⁶AbbVie Inc., North Chicago, USA