¹CHA University, Gastroenterology, Seongnam, South Korea, ²CHA Cancer preventive Research center, Seongnam, South Korea

¹University of Padova, Department of Surgery, Oncology and Gastroenterology, Padova, Italy, ²IRCCS IOV Istituto Oncologico Veneto, Padova, Italy, ³Azienda Ospedaliera - Università di Padova, Padova, Italy, ⁴University of Padova, Department of Medicine, Padova, Italy, ⁵University of Padova, Department of Molecular Medicine, Padova, Italy

Philip Morris International Research and Development, System Toxicology, Neuchatel, Switzerland

¹University of Leuven, Department of Human Genetics, Laboratory for Complex Genetics, Leuven, Belgium, ²University Hospital Ghent, Department of Gastroenterology, Ghent, Belgium, ³University Hospital Brussels, Department of Gastroenterology, Brussels, Belgium, ⁴University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium, ⁵University of Leuven, Department of Chronic Diseases, Metabolism and Ageing (CHROMETA), Leuven, Belgium

Graduate School of Medicine, Kanazawa University, Gastroenterology, Kanazawa, Ishikawa, Japan

¹Motol University Hospital, Department of Pathology and Molecular Medicine, Prague, Czech Republic, ²Motol University Hospital, – Department of Paediatrics, Prague, Czech Republic, ³Motol University Hospital, Department of Paediatrics, Prague, Czech Republic

¹St Vincent's Hopspital, Sydney, Gastroenterology, Sydney, Australia, ²The Australian National University, National Centre for Epidemiology and Population Health, Canberra, Australia, ³The University of Western Australia, Centre for Microscopy, Characterisation and Analysis, Perth, Australia, ⁴University of Western Australia, School of Medicine and Pharmacology, Faculty of Health and Medical Sciences, Perth, Australia, ⁵St John of God Hospital, Centre for Inflammatory Bowel Diseases, Subiaco, Australia, ⁶Telethon Kids Institute, Inflammation, Subiaco, Australia, ⁷The Garvan Institute of Medical Research, Osteoporosis and Bone Biology, Sydney, Australia, ⁸St Vincent's Hospital Sydney, Endocrinology, Sydney, Australia

¹King's College London, Faculty of Life Sciences and Medicine, Department of Nutritional Sciences, London, UK, ²King's College London, Institute of Pharmacological Sciences, London, UK, ³Bart’s and the London NHS Trust, Gastroenterology Department, London, UK, ⁴King's College London, Faculty of Nursing, Midwifery and Palliative Care, London, UK

¹University of Valencia, Pharmacology, Valencia, Spain, ²Fisabio Hospital Dr Peset, Valencia, Spain, ³University of Valencia, Medicine, Valencia, Spain, ⁴CIBERehd, Valencia, Spain, ⁵Hospital of Manises, Servicio de Cirugía, Valencia, Spain

¹Korea University Ansan Hospital, Internal Medicine, Seoul, South Korea, ²Korea University College of Medicine, Seoul, South Korea

¹University College London Hospital, Nutrition and Dietetics, London, UK, ²University College London, London, UK, ³University College London, London, UK

¹Nordic Bioscience A/S, Biomarkers and Research, Herlev, Denmark, ²University of Southern Denmark and Odense University Hospital, Department of Medical Gastroenterology, Odense, Denmark, ³San Matteo Hospital Foundation and University of Pavia, Department of Internal Medicine, Pavia, Italy, ⁴University College of London, Institute for Liver and Digestive Health, London, UK

¹University Medical Center Utrecht, Gastroenterology and Hepatology, Utrecht, The Netherlands, ²Icahn School of Medicine at Mount Sinai, Division of Gastroenterology, Department of Medicine, New York City, USA, ³Hospital Beatriz Ângelo, Division of Gastroenterology, Surgical Department, Loures, Portugal, ⁴Icahn School of Medicine at Mount Sinai, Department of Medicine, New York City, USA

¹St Mark's Hospital, London North West Hospitals NHS Trust, London, UK, ²Queen Mary University of London, Barts Cancer Institute, London, UK

¹Shaare Zedek Medical Center, The Juliet Keidan Institute of Paediatric Gastroenterology and Nutrition, Jerusalem, Israel, ²Hebrew University of Jerusalem, Computer Science, Jerusalem, Israel, ³Hospital for Sick Children, Division of Gastroenterology, Toronto, Canada, ⁴The Hospital for Sick Children, Department of Diagnostic Imaging, Toronto, Canada, ⁵Hospital for Sick Children, Department of Diagnostic Imaging, Toronto, Canada, ⁶Shaare Zedek Medical Center, Pediatric Radiology Unit, Jerusalem, Israel, ⁷Connecticut Children's Medical Center, Division of Digestive Diseases, Hepatology, and Nutrition, Hartford, USA, ⁸Hôpital Necker Enfants Malades, Department of Pediatric Gastroenterology, Paris, France, ⁹Royal Hospital for Children,, Department of Paediatric Gastroenterology, Glasgow, UK, ¹⁰Hospital Sant Joan de Deu, Department of Gastroenterology, Hepatology and Pediatric Nutrition, Barcelona, Spain, ¹¹Tel Aviv Sourasky Medical Center, Diagnostic Imaging Division, Tel Aviv, Israel

King's College Hospital NHS Foundation Trust, London, UK

¹University of Duisburg-Essen, Integrative Gastroenterology, Kliniken Essen-Mitte, Essen, Germany, ²University Hospital Essen, Institute of Diagnostic and Interventional Radiology and Neuroradiology, Essen, Germany, ³University Hospital Essen, Clinic for Gastroenterology and Hepatology, Essen, Germany, ⁴University of Duisburg-Essen, Integrative and Internal Medicine, Essen, Germany, ⁵University of Duisburg-Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany, ⁶University Duisburg-Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, Essen, Germany

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

¹Medical University of Vienna, Vienna, Austria, ²Atrius Health, Boston, USA, ³Genentech, Inc., South San Francisco, USA, ⁴Christian-Albrechts-University, Kiel, Germany, ⁵Roche Products Limited, Welwyn Garden City, UK, ⁶AO Ordine Mauriziano di Torino, Turin, Italy

¹Shaare Zedek Medical Center, Institute of Pediatric Gastroenterology, Jerusalem, Israel, ²CHEO, Ottawa, Canada, ³National Children’s Research Centre and University College Dublin, Dublin, Ireland, ⁴IWK, Halifax, Canada, ⁵Barts and the London School of medicine, Queen Mary University of London, London, UK, ⁶UNC Health Care, North Carolina, USA, ⁷Boston Children Hospital, Boston, USA, ⁸SickKids, Toronto, Canada