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

¹University of Birmingham, Birmingham, UK, ²Janssen, Inc., Toronto, Canada, ³Janssen-Cilag, Cologno Monzese MI, Italy, ⁴Janssen Scientific Affairs, LLC, Horsham, USA, ⁵University Hospital Gasthuisberg, Department of Gastroenterology, Leuven, Belgium, ⁶Icahn School of Medicine at Mount Sinai, New York, USA, ⁷Northwestern University Feinberg School Of Medicine, Chicago, USA, ⁸University of Western Ontario and Robarts Research Institute, London, Canada

¹Gastroenterology Department, Lille, France, ²Department of Digestive Diagnostic and Interventional Radiology, Lille, France

¹McGill University, Gastroenterology, Montreal, Canada, ²University of British Columbia, Department of Gastroenterology, Vancouver, Canada

¹Sheba Medical Center, Department of Diagnostic Imaging, Tel Hashomer, Israel, ²Sheba Medical Center, Gastroenterology, Tel Hashomer, Israel, ³Sheba Medical Center, Gastroenterology, Ramat Gan, Israel

¹Chaim Sheba Medical Center, Gastroenterology, Ramat Gan, Israel, ²Chaim Sheba Medical Center, Diagnostic Imaging, Ramat Gan, Israel

¹McMaster University, Gastroenterology, Hamilton, ON, Canada, ²McMaster University, Gastroenterology, Hamilton, Canada, ³Mount Sinai Hospital, Gastroenterology, New York, USA

¹University Hospital Zurich, Division of Gastroenterology and Hepatology, Zurich, Switzerland, ²University Hospital Lausanne - CHUV, Institute of Social and Preventive Medicine, Lausanne, Switzerland, ³University Hospital Lausanne, Division of Gastroenterology and Hepatology, Lausanne, Switzerland, ⁴University of Bern, Institute of Social and Preventive Medicine, Bern, Switzerland

¹University of Liverpool, Department of Gastroenterology, Liverpool, UK, ²Hope Hospital, Department of Gastroenterology, Salford, UK, ³Royal Liverpool University Hospital, Liverpool, UK