¹Bicêtre Hospital - APHP, Gastro-enterology, Kremlin-Bicêtre, France, ²University Hospital Paul Brousse, Liver and biliary-tract disease center, Villejuif, France, ³Universite Paris Sud, Institut Gustave Roussy, Centre for Research in Epidemiology and Population Health / INSERM, UMRS 1018, Team 9, Villejuif, France

¹University of Calgary, IBD Unit, Division of Gastroenterology and Hepatology, Calgary, Canada, ²Mayo Clinic Rochester, Division of Colorectal Surgery, Rochester, USA, ³Mayo Clinic Rochester, Division of Gastroenterology and Hepatology, Rochester, USA

NHS Lothian, Gastroenterology, Edinburgh, UK

¹University Hospital Estaing, Gastroenterology Department, Clermont-Ferrand, France, ²University Hospital, Gastroenterology Department, Lille, France, ³CHU de Montpellier, Department of Gastroenterology, Montpellier, France, ⁴Archet 2 University Hospital, Department of Gastroenterology, Nice, France, ⁵Hospital Henri-Mondor, Department of Gastroenterology, Creteil, France, ⁶University Hospital of Besançon, Gastroenterology, Besançon, France, ⁷University Hospital, Gastroenterology Department, Amiens, France, ⁸University Hospital of Lille, Gastroenterology, Lille, France, ⁹University Hospital, Biostatistics Unit, DRCI, Clermont-Ferrand, France, ¹⁰UMR 1071 Inserm/Université d'Auvergne; USC-INRA 2018, Microbes, Intestine, Inflammation and Susceptibility of the Host, Clermont-Ferrand, France

¹Academic Medical Center (AMC), Department of Surgery, Amsterdam, The Netherlands, ²Academic Medical Center (AMC), Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands

¹University Medical Center Dresden, Department of Medicine I, Dresden, Germany, ²University Hospital Schleswig-Holstein, Department of Internal Medicine I, Kiel, Germany, ³University Hospital Schleswig-Holstein, Institute of Clinical Molecular Biology, Kiel, Germany, ⁴Christian-Albrechts-Universität zu Kiel, Institute of Immunology, Kiel, Germany

¹Brighton and Sussex University Hospitals NHS Trust, UK, Gastroenterology, Brighton and Hove, UK, ²Sussex Partnership NHS Foundation Trust, UK, Liason Psychiatry, Brighton and Hove, UK

University of Chicago, Chicago, USA

¹University of Bari, Department of Emergency and Organ Transplantation, Bari, Italy, ²University of Bari, DETO, Bari, Italy, ³Azienda Ospedaliera Consorziale Policlinico, Bari, Italy, ⁴IRCCS Saverio de Bellis, Department of Gastroenterology and Digestive Endoscopy, Castellana Grotte, Italy

Leiden University Medical Center, Gastroenterology, Leiden, The Netherlands

¹Academic Medical Centre (AMC), Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ²Academic Medical Center (AMC), Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ³VuMC, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands

¹Hospital Universitario Central de Asturias, Gastroenterology, Oviedo, Spain, ²Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain

¹National and Kapodistrian University of Athens, Laiko General Hospital, Academic Department of Gastroenterology, Athens, Greece, ²Alexandra Hospital, Gastroenterology Unit, Athens, Greece, ³Metaxa Memorial Cancer Hospital of Piraeus, Department of Gastroenterology, Athens, Greece, ⁴General Hospital of Nikea and Piraeus Agios Panteleimon, Department of Gastroenterology, Athens, Greece, ⁵on behalf of the Greek Vedolizumab Study group, Athens, Greece

¹Kagawa Prefectural Central Hospital, Department of gastroenterology, Takamatsu, Japan, ²Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Department of Gastroenterology and Hepatology, Okayama city, Japan, ³National Hospital Organization Fukuyama Medical center, Department of Gastoenterology, Fukuyama city, Japan, ⁴Japanese Red Cross Society Himeji Hospital, Department of Internal Medicine, Himeji city, Japan, ⁵Tsuyama chuo Hospital, Depatment of Gastroenterology, Tsuyama city, Japan, ⁶Saiseikai Imabari Hospital, Department of Internal medicine, Imabari city, Japan, ⁷Iwakuni medical center, Department of Gastroenterology, Iwakuni, Japan, ⁸Hiroshima City Hiroshima Citizens Hospital, Department of Gastroenterology, Hiroshima city, Japan, ⁹Mitoyo General Hospital, Department of Gastroenterology, Mitoyo City, Japan, ¹⁰Fukuyama City hospital, Department of gastroenterology, Fukuyama City, Japan, ¹¹Sumitomo Besshi Hospital, Department of Internal medicine, Niihama city, Japan, ¹²Wakayama Medical University, Second Department of Internal Medicine, Wakayama City, Japan

¹Rabta Hospital, Gastroenterology "A", Tunis, Tunisia, ²Rabta Hospital, Surgery "A", Tunis, Tunisia

¹Hospital General Universitario Alicante, Alicante, Spain, ²CIBERehd, Madrid, Spain, ³Hospital Universitario Virgen Macarena, Sevilla, Spain, ⁴Hospital Juan Ramón Jiménez, Huelva, Spain, ⁵Hospital San Juan, Alicante, Spain, ⁶Hospital General Universitario Elche, Elche, Spain

¹Nabeul-Tunisia, Department of gastroenterology Nabeul-Tunisia, Nabeul, Tunisia, ²Nabeul-Tunisia, Nabeul-Tunisia, Nabeul, Tunisia, ³Mohamed Taher Maamouri Hospital, Department of Gastroenterology, Nabeul, Tunisia

¹Grant MacEwan, Edmonton, Canada, ²University of Alberta, Edmonton, Canada, ³University of Alberta, Gastroenterology, Edmonton, Canada

Saitama Medical Center, Saitama Medical University, Department of Gastroenterology and Hepatology, Kawagoe City, Saitama, Japan

Birmingham Children's Hospital, Gastroenterology, Birmingham, UK