¹Hospital Universitario de La Princesa, IIS-IP and CIBERehd, Gastroenterology Unit, Madrid, Spain, ²Hospital Universitario de La Princesa and IIS-IP , Preventive medicine unit, Madrid, Spain

¹Topivert Pharma Ltd, London, United Kingdom, ²Barts and the London, School of Medicine and Dentistry, London, United Kingdom, ³Homerton University Hospital, Academic Department of Medical and Surgical Gastroenterology, London, United Kingdom

¹Department of Clinical Science, Karolinska Institutet, Danderyd Hospital, Stockholm, Sweden, Stockholm, Sweden, ²Karolinska Institutet, Danderyds hospital, Department of Clinical Science, Stockholm, Sweden, ³Department of Gastroenterology, University Hospital Skane, Sweden, Malmö, Sweden, ⁴Department of Medicine, Division of Gastroenterology and Hepathology at Karolinska Institutet, Huddinge, Sweden, Stockholm, Sweden, ⁵Department of Medicine, Kristianstad Hospital, Kristianstad, Sweden,, Kristianstad, Sweden, ⁶Departments of Internal Medicine, Vrinnevi Hospital, Norrköping, Sweden, Norrköping, Sweden

¹Instituto Nacional de Ciencias Médicas y Nutrición, Inflammatory Bowel Disease Clinic, Department of Gastroenterology, Mexico, Mexico, ²Instituto Nacional de Ciencias Médicas y Nutrición, Inflammatory Bowel Disease Clinic. Department of Gastroenterology, Mexico, Mexico, ³Instituto Nacional de Ciencias Médicas y Nutrición, Department of Immunology and Rheumatology, Mexico, Mexico

¹University of Alberta, Gastroenterology, Edmonton, Canada, ²University of Alberta, Edmonton, Canada

Hanyang University Guri Hospital, Gastroenterology, Guri, South Korea

¹Medical University of Bialystok, Department of Gastroenterology and Internal Medicine, Bialystok, Poland, ²Medical University of Bialystok, Department of Paediatrics, Gastroenterology and Allergology, Bialystok, Poland, ³Medical University of Bialystok, Department of Haematological Diagnostics, Bialystok, Poland, ⁴Medical University of Bialystok, Department of Medical Pathomorphology, Bialystok, Poland

¹St George’s Hospital, Gastroenterology, London, United Kingdom, ²Department of Primary Care and Public Health, Imperial College, London, United Kingdom

¹University Hospitals Leuven, Gastroenterology, Leuven, Belgium, ²University Hospitals Leuven, Pathology, Leuven, Belgium, ³Hospital Universitari Germans Trias i Pujol, Gastroenterology, Badalona, Spain, ⁴Mc Gill University Health Centre, Gastroenterology, Montreal, Canada

¹Paediatric Gastroenterology and Nutrition Unit, Hospital Materno Infantil, Málaga, Spain, ²IBIMA, Biomedical Institute of Málaga, Málaga, Spain, ³Unit for the Comprehensive Care of Paediatric Inflammatory Bowel Disease, Department of Paediatric Gastroenterology, Hepatology and Nutrition, Barcelona, Spain, ⁴IWK Health Centre, Halifax, Nova Scotia, Canada, ⁵Hospital for Sick Children, Toronto, Ontario, Canada, ⁶Hôpital Necker-Enfants Malades, Paris, France, ⁷Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada, ⁸Jagiellonian University Medical College, Krakow, Poland, ⁹Schneider Children’s Medical Centre, Petach Tikvah, Israel, ¹⁰Rambam Health Care Campus, Haifa, Israel, ¹¹Cincinnati Children’s Hospital Medical Centre, Cincinnati, Ohio,United States, ¹²Royal Hospital for Children, Glasgow, United Kingdom, ¹³Institute of Paediatric Gastroenterology, Shaare Zedek Medical Centre, The Hebrew University of Jerusalem, Jerusalem, Israel, ¹⁴Hospital for Sick Children, Toronto, Canada

¹Goethe-University Frankfurt, Gastroenterology, Frankfurt am Main, Germany, ²University Erlangen, Erlangen, Germany, ³AbbVie Deutschland GmbH & Co.KG, Wiesbaden, Germany, ⁴Gastroenterology Practice, Minden, Germany

¹St Mark’s Hospital, Department of Surgery, Harrow, United Kingdom, ²St Mark’s Hospital, Department of Gastroenterology, Harrow, United Kingdom

University Hospital Santiago de Compostela, Gastroenterology, Santiago, Spain

¹ENEA, Department of Radiobiology and Humal Health, Rome, Italy, ²Sapienza University of Rome, Department of Cellular Biotechnology and Haematology, Rome, Italy, ³University of Padova, Department of Surgical, Oncological and Gastroenterological Sciences, Padova, Italy, ⁴Internal Medicine and Gastroenterology - Complesso Integrato Columbus - Catholic University, Department of Internal Medicine, Rome, Italy, ⁵Sapienza, Rome, Paediatric Gastroenterology and Liver Unit, Rome, Italy

¹Institute of Digestive Disease, the Chinese University of Hong Kong, Hong Kong, China, ²National University Hospital of Singapore, Singapore, ³The First Affiliated Hospital of San Yat Sen University, Guangzhou, China, ⁴University of Malaya Medical Centre, Kuala Lumpur, Malaysia, ⁵Maharaj Nakorn Chiangmai Hospital, Chiangmai, Thailand, ⁶King Chulalongkorn Memorial Hospital, Bangkok, Thailand, ⁷Siriraj Hosptial, Bangkok, Thailand, ⁸Colombo North Teaching Hospital, Ragama, Sri Lanka, ⁹West China Hospital, Sichuan University, Chengdu, China, ¹⁰Department of Gastroenterology, Xijing Hospital, Fourth Military Medical University, Shaanxi, China, ¹¹Faculty of Medicine Universitas Indonesia/Dr Cipto Mangunkusumo Hospital, Depok Municipality, Indonesia, ¹²Kiangwu Hospital, Macau, Macao, ¹³Hospital Conde S Januario, Macau, Macao, ¹⁴Singapore General Hospital, Singapore, Singapore

¹DGD Clinics Sachsenhausen, Frankfurt/Main, Germany, ²Agaplesion Markus Krankenhaus, Frankfurt/Main, Germany, ³Interdisciplinary Crohn Colitis Centre Rhein-Main, Frankfurt/Main, Germany

Kitasato University Kitasato Institute Hospital, Centre for Advanced IBD Research and Treatment, Tokyo, Japan

¹University Hospital Estaing, Gastroenterology Department, Clermont-Ferrand, France, ²UMR 1071 Inserm/Université d’Auvergne; USC-INRA 2018, Microbes, Intestine, Inflammation and Susceptibility of the Host, Clermont-Ferrand, France, ³Private practice, Nimes, France, ⁴University Hospital, Gastroenterology Department, Bordeaux, France, ⁵Hospices Civils de Lyon, Lyon-Sud Hospital, Gastroenterology, Pierre Benite, France, ⁶University Hospital, Gastroenterology Department, Amiens, France, ⁷University Hospital, Gastroenterology Department, Lille, France, ⁸Private practice, Nantes, France, ⁹University Hospital, Gastroenterology Department, Nantes, France, ¹⁰Private practice, Cornebarrieu, France, ¹¹Private practice, Clermont-Ferrand, France, ¹²Private practice, St Quentin, France, ¹³Private practice, Arles, France, ¹⁴Archet 2 University Hospital, Department of Gastroenterology, Nice, France, ¹⁵Private practice, Riom, France, ¹⁶Private practice, Chateauroux, France, ¹⁷Private practice, Beaumont, France, ¹⁸University Hospital, Bordeaux, France, ¹⁹CHU Nancy Brabois, Department of Gastroenterology, Vandoeuvre les Nancy, France, ²⁰GM – Clermont-Ferrand University and Medical Centre, Biostatistics Unit , Clermont-Ferrand, France, ²¹University Hospital of Lille, Gastroenterology, Lille, France, ²²University Hospital, Rennes, France

¹University ‘Federico II’ of Naples, Department of Clinical Medicine and Surgery, Naples, Italy, ²University ‘Federico II’ of Naples, Naples, Italy

¹University of Debrecen, Clinical Centre, Department of Internal Medicine, Division of Gastroenterology, Debrecen, Hungary, ²Institute of Experimental Immunology, Euroimmun AG, Lubeck, Germany, ³Inova Diagnostics, Inc., San Diego, California, United States, ⁴Semmelweis University, First Department of Paediatrics, Budapest, Hungary, ⁵Semmelweis University, First Department of Medicine, Budapest, Hungary