¹Institute of Social and Preventive Medicine, Healthcare Evaluation Unit, Lausanne, Switzerland, ²Crohn and Colitis Center, Gastroenterology Beaulieu SA, Lausanne, Switzerland

¹Whipps Cross Hospital, Barts Health NHS Trust, London, UK

¹Universitätsklinikum Erlangen, Kinder- und Jugendklinik, Erlangen, Germany

¹Northwest Clinics, Department of Gastroenterology and Hepatology, Alkmaar, The Netherlands, ²Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology and Metabolism Research Institute, Amsterdam, The Netherlands, ³Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Epidemiology and Biostatistics, EMGO Institute for Health and Care Research, Amsterdam, The Netherlands

¹Division of Gastroenterology, Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil, ²Division of Clinical Immunology, Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil, ³Division of Coloproctology, Department of Surgery and Anatomy, Ribeirão Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil, ⁴Molecular Biology Laboratory, Department of Surgery and Anatomy, Ribeirão Preto Medical School, University of São Paulo, Ribeirao Preto, Brazil, ⁵Department of Pathology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil

¹Galilee Medical Center, Institute of Gastroenterology and Liver Diseases, Naharia, Israel, ²The Nazareth Hospital, EMMS, Gastroenterology and Endoscopy United, Nazareth, Israel, ³Hadassah University Hospital, Ein Kerem, Institute of Gastroenterology and Liver Diseases, Jerusalem, Israel

¹University Hospitals Leuven, Catholic University of Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium, ²Imelda General Hospital, Department of Gastroenterology, Bonheiden, Belgium, ³Catholic University of Leuven, Department of Pharmaceutical and Pharmacological Sciences, Leuven, Belgium, ⁴Hospital Clínic of Barcelona, IBD Unit, Radiology Department, Barcelona, Spain, ⁵Imelda General Hospital, Department of Radiology, Bonheiden, Belgium, ⁶University Hospitals Leuven, Catholic University of Leuven, Department of radiology, Leuven, Belgium, ⁷Nancy University Hospital, INSERM U947 and Department of Radiology, Vandoeuvre-lès-Nancy, France, ⁸Beaujon Hospital, Department of Radiology, Clichy, France, ⁹Rouen University Hospital, Normandy University, Department of Radiology, Rouen, France, ¹⁰Nancy University Hospital, INSERM U954 and Department of Hepato-Gastroenterology, Vandoeuvre-lès-Nancy, France

¹Seoul National University College of Medicine, Seoul, South Korea, ²Seoul National University Bundang Hospital, Seongnam-si, South Korea

¹Hokkaido University Faculty of Medicine and Graduate School of Medicine, Division of Endoscopy/Department of Gastroenterology and Hepatology, Sapporo, Japan, ²Hokkaido University, Faculty of Advanced Life, Science Graduate School of Life Science, Department of Cell Biological Science, Sapporo, Japan

¹University Hospital ‘Tsaritsa Yoanna – ISUL’, Gastroenterology Clinic, Sofia, Bulgaria, ²University Hospital ‘Tsaritsa Yoanna – ISUL’, Microbiology and Virology Department, Sofia, Bulgaria, ³University of National and World Economy, Department of Statistics and Econometrics, Sofia, Bulgaria

¹National University Health System, University Medicine Cluster, Singapore, Singapore, ²National University Health System, Division of Gastroenterology and Hepatology, Singapore, Singapore, ³National University of Singapore, Yong Loo Lin School of Medicine, Singapore, Singapore, ⁴National University Health System, Khoo Teck Puat-National University Children’s Medical Institute, Singapore, Singapore, ⁵University of Auckland, Auckland, New Zealand

¹Hadassah University Medical Center, Jerusalem, Israel

¹CSK Mswia, Department of Gastroenterological Surgery and Transplantation, Warsaw, Poland, ²Mossakowski Medical Research Centre of the Polish Academy of Sciences, Department of Surgical Research and Transplantology, Warsaw, Poland, ³CSK MSWiA, Diagnostic Radiology Department, Warsaw, Poland, ⁴Medical Centre of Postgraduate Education, Warsaw, Poland

¹University of California, Los Angeles, Vatche and Tamar Manoukian Division of Digestive Diseases, Center for Inflammatory Bowel Diseases, Los Angeles, USA

¹Hyogo College of Medicine, Department of Intestinal Inflammation Research, Nishinomiya, Japan, ²Hyogo College of Medicine, Department of Inflammatory Bowel Disease, Nishinomiya, Japan

¹Lebanese University, Faculty of Medical Sciences, Gastroenterology, Hadath, Lebanon, ³Lebanese University, Faculty of Medical Sciences, Pathology, Hadath, Lebanon, ⁴Sacre Coeur Hospital, Gastroenterology, Hadath, Lebanon, ⁵Saint Joseph University, Gastroenterology, Beirut, Lebanon

¹University of Birmingham, Institute of Applied Health Research, Birmingham, UK, ²University Hospital Birmingham, Birmingham, UK, ³University of Birmingham, Academic Department of Surgery, Birmingham, UK

¹University Paediatric Hospital, Department of Gastroenterology and Hepatology, Sofia, Bulgaria

¹University of Ulsan College of Medicine, Asan Medical Center, Department of Gastroenterology, Seoul, South Korea, ²University of Ulsan College of Medicine, Asan Medical Center, Gastroenterology, Seoul, South Korea, ³University of Ulsan College of Medicine, Asan Medical Center, Nursing, Seoul, South Korea, ⁴University of Ulsan College of Medicine, Asan Medical Center, Inflammatory Bowel Disease Center, Seoul, South Korea

¹Medicine Faculty of Tunis, Gastroenterology Department of Habib Thameur Hospital (Tunisia), Tunis, Tunisia