¹Hospital de la Santa Creu i Sant Pau, Barcelona, Spain, ²Hospital Universitari Germans Trias i Pujol, Badalona, Spain, ³Centro de Investigación Biomédica en Red en el Área temática de Enfermedades Hepáticas (CIBEREHD), Barcelona, Spain

¹Oxford Brookes University, Oxford Institute of Nursing, Midwifery and Allied Health Research, Oxford, UK, ²University of Oxford, Nuffield Department of Medicine, Oxford, UK

¹Stockport Acute Foundation Trust, Gastroenterology, Stockport, UK, ²Macclesfield Hospital, Gastroenterology, Macclesfield, UK, ³Royal Blackburn Hospital, Gastroenterology, Blackburn, UK, ⁴University Hospital Of South Manchester, Gastroenterology, Manchester, UK, ⁵University Of South Manchester, Gastroenterology, Manchester, UK

St Mark's Hospital, Paediatric Gastroenterology, Harrow, UK

Gastroenterology Unit Brotzu Hospital, Cagliari, Italy

Complejo Hospitalario Universitario de Ferrol, Unidad de EICI, Servicio de Digestivo, Ferrol, Spain

King's College London, Florence Nightingale Faculty of Nursing and Midwifery, London, UK

¹King's College London, Faculty of Life Sciences and Medicine, Department of Nutritional Sciences, London, UK, ²Trakia University, Faculty of Medicine, Stara Zagora, Bulgaria, ³Hôpital Archet2- 4èmeB- CHU de Nice, Pôle digestif- Nutrition Clinique, Nice, France, ⁴Rabin Medical Center - Beilinson Hospital, Department of Gastroenterology, Petah Tikva, Israel, ⁵Bnai Zion Medical Center, Gastroenterology Department, Haifa, Israel, ⁶Instituto Clinico Humanitas, Rozzano, Italy, ⁷Fondazione Policlinico Universitario Agostino Gemelli, Gastroenterology and Hepatology Group, Roma, Italy, ⁸Fondazione Policlinico Universitario Agostino Gemelli, Gastroenterology and Hepatology, Rome, Italy, ⁹Fondazione Policlinico Universitario Agostino Gemelli, Gastroenterology and Hepatology, Roma, Italy, ¹⁰Ostfold University College, Halden, Norway, ¹¹Hospital Clinic Barcelona, Gastroenterology, Barcelona, Spain, ¹²Hospital Ramón y Cajal, Gastroenterology, Madrid, Spain, ¹³Hospital del Mar, IBD and Digestology Department, Barcelona, Spain, ¹⁴Vall Hebron Universitary Hospita, IBD Unit Gastroenterology Department, Barcelona, Spain, ¹⁵Hospital San Juan de Dios del Aljarafe, Internal Medicine, Seville, Spain, ¹⁶Hospital Clínic de Barcelona, IBD Unit Gastroenterology Department, Barcelona, Spain, ¹⁷Stockholm Gastro Center, Stockholm, Sweden, ¹⁸Elisabeth-TweeSteden Ziekenhuis, Gastroenterology and Hepatology, Tilburg, The Netherlands, ¹⁹Az Delta Hospital, Roeselare, Belgium

¹University hospital of Linköping, Gastroenterology and hepatology, Linköping, Sweden, ²Faculty of Medicine, Linköping University, Department of Medical and Health Sciences, Linköping, Sweden, ³Department of Medical and Health Sciences, Linköping University, Department of Anaesthesiology and Intensive Care, Linköping, Sweden, ⁴Clinical and Experimental Medicine, Linköping University, Department of Gastroenterology and Department, Linköping, Sweden, ⁵Department of Medical and Health Sciences, Linköping University, Centre for Organisational support and Development, Linköping, Sweden

¹Linköping University, Department of Clinical and Experimental Medicine, Linköping, Sweden, ²Örebro University, Department of Medical Sciences, Örebro, Sweden, ³Aleris Medilab, Department of Pathology and Cytology, Täby, Sweden, ⁴Örebro University, Department of Gastroenterology, Örebro, Sweden

¹Maastricht University Medical Center, Department of Internal Medicine, Division of Gastroenterology and Hepatology, Maastricht, The Netherlands, ²Maastricht University Medical Center, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht, The Netherlands, ³LifeGlimmer GmbH, Berlin, Germany, ⁴Wageningen University & Research, Laboratory of Systems and Synthetic Biology, Wageningen, The Netherlands, ⁵Zuyderland Medical Centre, Department of Gastroenterology and Hepatology, Sittard-Geleen/Heerlen, The Netherlands

¹Translational Research Center for GastroIntestinal Disorders (TARGID), Chronic Diseases, Metabolism and Ageing (CHROMETA), Leuven, Belgium, ²Rega Institute for Medical Research, Microbiology and Immunology, Leuven, Belgium, ³University Hospitals Leuven, Gastroenterology and Hepatology, Leuven, Belgium, ⁴Laboratory of Complex Genetics, Human Genetics, Leuven, Belgium

¹Friedrich-Alexander-University Erlangen-Nürnberg, First Department of Medicine, Erlangen, Germany, ²InDex Pharmaceuticals AB, Stockholm, Sweden

¹Instituto Clinico Humanitas, Milan, Italy, ²University Erlangen, Nurnberg, Germany, ³Torunskie Centrum Gastrologiczne Gastromed, Torun, Poland, ⁴Connecticut Clinical Research Foundation of Bristol Hospital, Bristol, USA, ⁵West Gastroenterology Medical Group, Los Angeles, USA, ⁶Clinical Research Institute of Michigan, Chesterfield, USA, ⁷Celgene Corporation, Summit, USA

¹Academic Medical Center, Gastroenterology and Hepatology, Amsterdam, The Netherlands, ²Academic Medical Center (AMC), Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ³Academic Medical Center (AMC), Department of Surgery, Amsterdam, The Netherlands

¹University of Erlangen-Nuremberg, Department of Medicine I, Erlangen, Germany, ²University of East Anglia, Norwich Medical School, Norwich, UK

¹Translational Research Center for GastroIntestinal Disorders (TARGID), Chronic Diseases, Metabolism and Ageing (CHROMETA), Leuven, Belgium, ²Rega Institute for Medical Research, Microbiology and Immunology, Leuven, Belgium, ³Kepler Diagnostics, Inc., Simi Valley, USA, ⁴University Hospitals Leuven, Gastroenterology and Hepatology, Leuven, Belgium

¹Lille Hospital and University, Public Health, Epidemiology and Economic Health, Epimad Registry, Regional House of Clinical Research, Lille, France, ²Lille University, Lille Inflammation Research International Center LIRIC-UMR 995 Inserm, Lille, France, ³Rouen Hospital and University, Gastroenterology Unit, Epimad Registry, Rouen, France, ⁴Lille University Jeanne de Flandre Children’s Hospital and Faculty of Medicine, Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lille, France, ⁵Lille University and Hospital, Biostatistics Unit, EA 2694, Lille, France, ⁶Lille University and Hospital, EA 2694 - Santé publique : épidémiologie et qualité des soins, Lille, France, ⁷Inria Lille Nord Europe, Modal, Lille, France, ⁸Gastroenterology Unit, Epimad Registry, Lille Hospital and University, Lille, France, ⁹Prometheus Laboratories Inc., San Diego, USA, ¹⁰Icahn School of Medicine at Mount Sinai, Division of Gastroenterology, New York, USA, ¹¹Amiens Hospital and University, Gastroenterology Unit, EPIMAD Registry, Amiens, France

¹Queen Mary University of London, Barts Cancer Institute, London, UK, ²St. Mark’s Hospital, Inflammatory Bowel Disease Unit, Harrow, UK, ³St. Mark’s Hospital, Pathology Department, Harrow, UK, ⁴University College London Hospital, Pathology Department, London, UK, ⁵Henry Wellcome Building of Genomic Medicine, Wellcome Trust Centre for Human Genetics, Oxford, UK

¹UMCG, Groningen, The Netherlands, ²The Broad Institute of MIT and Harvard, Cambridge, USA