Birmingham Children's Hospital, Gastroenterology, Birmingham, UK

¹Hokkaido University Graduate School of Medicine, Department of Gastroenterology and Hepatology, Sapporo, Japan, ²Hokkaido University Hospital, Diagnostic Center for Sonography, Sapporo, Japan, ³National Hospital Organization Hakodate Hospital, Department of Gastroenterology, Hakodate, Japan, ⁴Tomakomai City Hospital, Department of Clinical Laboratory, Tomakomai, Japan, ⁵Tomakomai City Hospital, Department of Gastroenterology, Tomakomai, Japan, ⁶Sapporo Higashi Tokushukai Hospital, Department of Clinical Laboratory, Sapporo, Japan, ⁷Sapporo Higashi Tokushukai Hospital, Inflammatory Bowel Disease Center, Sapporo, Japan, ⁸Ohguro Gastroenterological Hospital, Department of Clinical Laboratory, Sapporo, Japan, ⁹Ohguro Gastroenterological Hospital, Department of Gastroenterology, Sapporo, Japan, ¹⁰Sapporo Medical Center NTT EC, Department of Clinical Laboratory, Sapporo, Japan, ¹¹Sapporo Medical Center NTT EC, Department of Gastroenterology, Sapporo, Japan

¹Nordic Bioscience, Biomarkers and Research, Herlev, Denmark, ²Odense University Hospital, Department of Gastroenterology, Odense, Denmark, ³Aarhus University Hospital, Department of Hepatology and Gastroenterology, Aarhus, Denmark

¹John Radcliffe Hospital, University of Oxford, Translational Gastroenterology Unit, Oxford, UK, ²The Churchill Hospital, Oxford University Hospital, Department of Medical Oncology, Oxford, UK

¹Hospital da Senhora da Oliveira-Guimarães, Gastroenterology, Guimarães, Portugal, ²University of Minho, Life and Health Sciences Research Institute (ICVS), School of Medicine, Braga, Portugal, ³University of Minho, ICVS/3B’s, PT Government Associate Laboratory, Braga, Portugal

¹APHP St. Antoine Hospital, Department of Gastroenterology and Nutrition, Paris, France, ²APHP Cochin Hospital, Dermatology, Paris, France

¹Queen Elizabeth Hospital, Department of Medicine, Hong Kong, Hong Kong, ²Inflammatory Bowel Disease Center University of Chicago Medicine, Chicago, USA, ³University Hospital Estaing, Gastroenterology Department, Clermont-Ferrand, France, ⁴UMR 1071 Inserm/Université d'Auvergne; USC-INRA 2018, Microbes, Intestine, Inflammation and Susceptibility of the Host, Clermont-Ferrand, France, ⁵University Hospital, Biostatistics Unit, DRCI, Clermont-Ferrand, France

¹University of Duisburg-Essen, Integrative Gastroenterology, Kliniken Essen-Mitte, Essen, Germany, ²Tech Lab Inc., Blacksburg, USA, ³Labor L+S, Enterosan, Bad Bocklet-Grossenbrach, Germany, ⁴Ruhr University Bochum, Pathology Department, Bochum, Germany

¹Kazan State Medical University, Kazan, Russian Federation, ²Republican Clinical Hospital, Kazan, Russian Federation

¹Medical University of Bialystok, Poland, Department of Pediatrics, Gastroenterology, Hepatology, Nutrition and Allergology, Bialystok, Poland, ²Medical University of Bialystok, Poland, Department of Gastroenterology and Internal Medicine, Bialystok, Poland, ³Medical University of Bialystok, Poland, Department of Pathomorphology, Bialystok, Poland, ⁴The Children's Memorial Health Institute, Warsaw, Department of Gastroenterology, Hepatology, Feeding Disorders and Paediatrics, Warsaw, Poland

¹Medical School and University Hospital of Ioannina - Greece, Department of Gastroenterology and Hepatology, Ioannina, Greece, ²Beth-Israel Deaconess Medical Center, Harvard Medical School, Center for Inflammatory Bowel Diseases, Division of Gastroenterology, Boston, Massachussets, USA, ³University Hospital of Nancy, University of Lorraine, INSERM Unité 954 and Department of Hepato-Gastroenterology, Houdemont, France, ⁴Mater Dei Hospital, Division of Gastroenterology, Malta, Malta

¹Erasmus MC-Sophia Children's Hospital, Department of 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, ⁴Amphia Hospital Breda, Department of Gastroenterology, Breda, The Netherlands, ⁵Amphia Hospital Breda, Department of Paediatrics, Breda, The Netherlands, ⁶Haga Hospital, Department of Gastroenterology, Den Haag, The Netherlands, ⁷Haga Hospital, Department of Paediatrics, Den Haag, The Netherlands, ⁸Academic Medical Center, Academic Center for Child Psychiatry the Bascule / Department of Child and Adolescent Psychiatry, Amsterdam, The Netherlands

¹Hospital of Modena, Internal Medicine, Modena, Italy, ²University Hospital of Modena, Rheumatology, Modena, Italy, ³University Hospital of Modena, Gastroenterology, Modena, Italy, ⁴University Hospital of Modena, Gastroenterology and Digestive Endoscopy, Modena, Italy

¹University of Chicago Medicine, Inflammatory Bowel Disease Center, Chicago, USA, ²University of Chicago Medicine, Section of Gastroenterology, Hepatology and Nutrition, Chicago, USA

¹Oslo University Hospital, Ulleval, Department of Gastroenterology, Clinics of Medicine, Oslo, Norway, ²University of Oslo, Oslo, Norway, ³Vestfold Hospital Trust, Tonsberg, Department of Gastroenterology, Tonsberg, Norway, ⁴Akershus University Hospital, Oslo, Norway, ⁵Stavanger University Hospital, Department of Gastroenterology, Stavanger, Norway, ⁶Innlandet Hospital Trust, Department of Gastroenterology, Gjovik, Norway, ⁷Aalesund Hospital, Aalesund, Norway, ⁸Telemark Hospital HF, Skien, Skien, Norway, ⁹Ostfold Hospital Trust, Department of Medicine, Kalnes, Norway, ¹⁰Ostfold University College, Health and welfare, Halden, Norway

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

¹Clinical Hospital Centre Rijeka, Gastroenterology, Rijeka, Croatia, ²KBC Rijeka, Department of Pediatrics, Rijeka, Croatia, ³Clinical Hospital Centre Rijeka, Radiology, Rijeka, Croatia, ⁴Clinical Hospital Centre Rijeka, Rijeka, Croatia

¹University of Crete, School of Medicine, Heraklion, Crete, Greece, ²University Hospital of Heraklion, Department of Gastroenterology, Heraklion, Crete, Greece

¹Bulent Ecevit University Medical Faculty, Gastroenterology, Zonguldak, Turkey, ²Bulent Ecevit University School of Medicine, Gastroenterology, Zonguldak, Turkey, ³Sanliurfa Ceylanpinar Public Hospital, Internal Medicine, Sanliurfa, Turkey

¹GoodGut SL, Girona, Spain, ²Universitat de Girona, Microbiologia, Girona, Spain, ³Institut de Investigació Biomèdica de Girona, Girona, Spain, ⁴Hospital Universitari Dr. Josep Trueta, Department of Gastroenterology, Girona, Spain, ⁵Hospital Universitari Germans Trias I Pujol, Department of Gastroenterology, Badalona, Spain, ⁶Hospital Universitari de Bellvitge, Department of Gastroenterology, Hospitalet de Llobregat, Spain, ⁷Hospital de Santa Caterina, Department of Gastroenterology, Salt, Spain, ⁸Centro Médico Teknon, Department of Gastroenterology, Barcelona, Spain