¹Örebro University, Department of Gastroenterology, Faculty of Medicine and Health, Örebro, Sweden, ²Örebro University, Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro, Sweden, ³Uppsala University, Department of Medical Sciences, Uppsala, Sweden

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

Hospital Santa Maria, Gastrenterology, Lisbon, Portugal

¹University Hospitals Leuven, Department of Paediatric gastroenterology, Leuven, Belgium, ²KU Leuven, Laboratory for Therapeutic and Diagnostic Antibodies, Department of Pharmaceutical and Pharmacological Sciences, Leuven, Belgium, ³University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium

Hannover Medical School, Department of Gastroenterology, Hepatology and Endocrinology, Hannover, Germany

¹Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands, ²CHU Bordeaux, Bordeaux, France, ³University of California at San Diego, San Diego, USA, ⁴Prometheus Laboratories Inc., San Diego, USA, ⁵University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium

¹University of Chicago Medicine, Inflammatory Bowel Disease Center, Chicago, USA, ²The Alfred Hospital, Melbourne, Australia, ³The Royal Melbourne Hospital, Gastroenterology Department, Melbourne, Australia

¹Algarve University Hospital Centre, Gastroenterology, Algarve, Portugal, ²Algarve Hospital Centre, Gastroenterology, Algarve, Portugal, ³Universidade do Algarve, Biomedical Science Department, Algarve, Portugal, ⁴Algarve University Hospital Center, Pathology, Algarve, Portugal, ⁵Health Community Centres Organization, Algarve, Portugal, ⁶Algarve University Hospital Center, Gastroenterology, Algarve, Portugal

University of Sfax, Sfax, Tunisia

¹Nicolaus Copernicus University, Collegium Medicum in Bydygoszcz, Department of Vascular Diseases and Internal Medicine, Bydgoszcz, Poland, ²Department of Gastroenterology and Hepatology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland, ³Department of Gastroenterology Medical University of Lodz, Łódź, Poland, ⁴Department of Gastroenterology, Hepatology, Feeding Disorders and Pediatrics The Children's Memorial Health Institute, Warszawa, Poland, ⁵Florence Nightingale Faculty of Nursing, Midwifery and Palliative Care, London, UK

¹Complejo Hospitalario de Pontevedra, Gastroenterology Unit, Pontevedra, Spain, ²Hospital De Sabadell, Institut Universitari Parc Taulí, Digestive Unit, Sabadell, Spain, ³Hospital Universitario Puerta de Hierro, Servicio de Gastroenterologia, Madrid, Spain, ⁴Hospital Vall d´Hebron, Gastroenterology Department, Barcelona, Spain, ⁵Hospital Universitari Germans Trias i Pujol and CIBERehd, Gastroenterology Unit, Badalona, Spain, ⁶Spanish Association of patients with Crohn´s disease and Ulcerative colitis, Madrid, Spain, ⁷MSD Spain, Medical Department, Madrid, Spain, ⁸Unidad de Gastroenterología,Hospital General de Valencia, Valencia, Spain

¹Shaare Zedek Medical Center, The Juliet Keidan Institute of Pediatric Gastroenterology and Nutrition, Jerusalem, Israel, ²Erasmus MC-Sophia Children’s Hospital, Pediatric Gastroenterology, Rotterdam, The Netherlands, ³Hospital for Sick Children, University of Toronto, Department of Paediatrics; Department of Gastroenterology, Hepatology and Nutrition, Toronto, Canada

University of Chicago Medicine, Inflammatory Bowel Disease Center, Chicago, USA

¹Iuliu Hatieganu University of Medicine and Pharmacy, Gastroenterology and Hepatology, Cluj-Napoca, Romania, ²Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania, ³County Clinical Emergency Hospital, Radiology, Cluj-Napoca, Romania

¹Cairo University, Kasralainy School of Medicine, Cairo, Egypt, ²Cairo University, Cairo, Egypt, ³Cairo University, Cairo, Egypt

¹Index Pharmaceuticals, Stockholm, Sweden, ²Aleris Medilab, Department of Pathology and Cytology, Täby, Sweden, ³Karolinska Institute, Stockholm, Sweden

¹I.M. Sechenov First Moscow State Medical University, Moscow, Russian Federation, ²Volgograd State Medical University, Volgograd, Russian Federation

¹Karolinska University Hospital, Gastroenterology Unit, Patient Area Gastroenterology, Dermatovenerology and Rheumatology, Stockholm, Sweden, ²Danderyds Hospital, Department of Medicine, Gastroenterology Unit, Stockholm, Sweden

Multispecialistic Centre for Recto-Perineal Diseases (IBD Unit), Department of Gastroenterology, Ospedale Sacro Cuore Don Calabria., Negrar (Verona, Italy), Italy

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, ³University of Chicago Medicine, Department of Surgery, Chicago, USA, ⁴Inflammatory Bowel Disease Center University of Chicago Medicine, Chicago, USA, ⁵University Hospital, Biostatistics Unit, DRCI, Clermont-Ferrand, France