¹University of Michigan, Pediatric Gastroenterology, Ann Arbor, USA, ²University of Michigan, Child Health Evaluation and Research (CHEAR) Center, Ann Arbor, USA, ³University of Michigan, Health Services Research Program, Department of Neurology, Ann Arbor, USA, ⁴University of Michigan, Pediatric Surgery, Ann Arbor, USA

¹Erasmus Medical Center - Sophia Children's Hospital, Paediatric gastroenterology, Rotterdam, The Netherlands, ²Centre for Immunobiology, Blizard Institute, Barts and the London School of Medicine, Queen Mary University of London, Paediatric gastroenterology, London, UK, ³Université Paris Descartes, Sorbonne Paris Cité, APHP, Hôpital Necker Enfants Malades, Paediatric gastroenterology, Paris, France

¹Amsterdam UMC - location AMC, Hospital Pharmacy, Amsterdam, The Netherlands, ²Amsterdam UMC - location AMC, Gastroenterology and Hepatology, Amsterdam, The Netherlands, ³Sanquin Diagnostic Services, Biologics Lab, Bioanalysis, Amsterdam, The Netherlands

¹Center for Diagnostic and Therapeutic Endoscopy, School of Medicine, Keio University, Tokyo, Japan, ²AbbVie GK, Tokyo, Japan, ³Center for Advanced IBD Research and Treatment, Kitasato Institute Hospital, Kitasato University, Tokyo, Japan

¹King's College London, Department of Nutritional Sciences, London, UK, ²Guy's and St Thomas' NHS Foundation Trust, Department of Gastroenterology, London, UK, ³Guy's and St Thomas' NHS Foundation Trust, London, UK

¹Helsinki University Hospital, Clinic of Gastroenterology, Helsinki, Finland, ²Esior Oy, Kuopio, Finland, ³Helsinki University Hospital/Jorvi Hospital, Department of Gastroenterology, Espoo, Finland, ⁴Kuopio University Hospital, Department of Internal Medicine, Kuopio, Finland, ⁵South Karelia Central Hospital, Department of Internal Medicine, Lappeenranta, Finland, ⁶Lapland Central Hospital, Department of Internal Medicine, Rovaniemi, Finland, ⁷Central Hospital of Central Finland, Department of Internal Medicine, Jyväskylä, Finland, ⁸Satakunta Central Hospital, Department of Internal Medicine, Pori, Finland, ⁹Vaasa Central Hospital, Department of Internal Medicine, Vaasa, Finland, ¹⁰Turku University Hospital, Division of Gastroenterology, Department of Medicine, Turku, Finland, ¹¹Kainuu Central Hospital, Department of Internal Medicine, Kajaani, Finland, ¹²Turku University Hospital/Salo hospital, Division of Gastroenterology, Department of Medicine, Salo, Finland, ¹³Central Ostrobothnia Central Hospital, Department of Internal Medicine, Kokkola, Finland, ¹⁴Janssen-Cilag AB, Medical Affairs, Solna, Sweden, ¹⁵Janssen-Cilag Oy, Medical Affairs, Espoo, Finland, ¹⁶Janssen-Cilag Limited, EPC - HEMAR, Buckinghamshire, UK, ¹⁷Department of Internal Medicine, Päijät-Häme Central Hospital, Lahti, Finland

¹IIS Hospital La Fe, Gastroenterology, Valencia, Spain, ²Hospital Universitari i Politècnic La Fe, Gastroenterology, Valencia, Spain, ³CIBEREHD, Madrid, Spain, ⁴IIS Hospital La Fe, Biostatistics, Valencia, Spain

¹Human Nutrition, School of Medicine, Dentistry and Nursing, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK, ²Department of Paediatric Gastroenterology, Hepatology and Nutrition, Royal Hospital for Children, Glasgow, UK, ³School of Engineering, University of Glasgow, Glasgow, UK, ⁴Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK, ⁵Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK

¹Univeristy of Calgary, Inflammatory Bowel Disease Unit, Calgary, Canada, ²University of Calgary, Community Health Sciences, Calgary, Canada, ³Univeristy of Calgary, Pediatric Gastroenterology, Calgary, Canada, ⁴University of British Columbia, Inflammatory Bowel Disease Unit, Vancouver, Canada

¹University Hospital Zurich, Department of Gastroenterology and Hepatology, Zurich, Switzerland, ²University of Lausanne, Institute of Social and Preventive Medicine, Lausanne, Switzerland, ³University Hospital Bern, Department of Visceral Surgery and Medicine, Bern, Switzerland

¹Samsung Medical Center, Department of Medicine, Seoul, South Korea

¹Clinical Center of Montenegro, Podgorica, Montenegro, ²Ars Medica, Podgorica, Montenegro, ³Faculty of Medicine, University of Montenegro, Podgorica, Montenegro

¹McMaster University, Department of Medicine (Division of Gastroenterology) and Farncombe Family Digestive Health Research Institute, Hamilton, ON, Canada

¹Tillotts Pharma AG, Rheinfelden, Switzerland

¹Cleveland Clinic Foundation, Colorectal Surgery, Cleveland, USA, ²Cleveland Clinic Foundation, Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland, USA

¹University of Szeged, First Department of Medicine, Szeged, Hungary

¹Evangelismos-Ophthalmiatreion Athinon-Polykliniki Hospital, Gastroenterology, Athens, Greece, ²University Hospital of Alexandroupoli, Democritus University of Thrace, 2nd Department of Internal Medicine, Alexandroupoli, Greece, ³University Hospital of Ioannina, Gastroenterology, Ioannina, Greece, ⁴University of Crete, Medical School, Gastroenterology, Heraklion, Greece, ⁵General Hospital of Nikea and Piraeus, Agios Panteleimon – Agia Varvara., Gastroenterology, Nicea, Greece, ⁶Venizeleio Pananeio General Hospital of Heraklion, Gastroenterology, Heraklion, Greece, ⁷University Hospital of Patras, Medical School, Gastroenterology, Patras, Greece, ⁸Alexandra General Hospital of Athens, Gastroenterology, Athens, Greece, ⁹Democritus University of Thrace, Digestive System Endoscopy Unit, Alexandroupoli, Greece, ¹⁰424 Military General Hospital, Gastroenterology and Hepatology, Thessaloniki, Greece, ¹¹Second Department of Internal Medicine - Propaedeutic, Research Institute and Diabetes Center, Department of Internal Medicine, Medical School, National and Kapodistrian University of Athens, Hepatogastroenterology Unit, Athens, Greece, ¹²Evangelismos Hospital, Gastroenterology, Athens, Greece, ¹³General Hospital of Nikea and Piraeus, Agios Panteleimon – Agia Varvara, Gastroenterology, Nicea, Greece, ¹⁴Merck Sharp and Dohme Pharmaceutical, Industrial and Commercial S.A, Athens, Greece

¹Sapporo Kosei General Hospital, IBD Center, Sapporo, Japan

¹GB Pant Institute of Postgraduate Medical Education and Research, Gastroenterology, New Delhi, India

¹Asahikawa Medical University, Department of Medicine, Asahikawa, Japan, ²Asahikawa Kosei General Hospital, Asahikawa, Japan, ³Asahikawa City Hospital, Asahikawa, Japan