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

University College London Hospitals NHS Foundation Trust, Gastroenterology, London, UK

Progenika Biopharma SA, R&D Department, Derio, Spain

Western General Hospital, Gastroenterology, Edinburgh, UK

Tokyo Yamate Medical Centre, Tokyo, Japan

¹University of North Carolina, Department of Medicine, Division of Gastroenterology and Hepatology, Chapel Hill, USA, ²University of Utah, Department of Medicine, Utah, USA, ³Carolinas Health Care, Medicine, Charlotte, USA, ⁴University of Michigan, Department of Internal Medicine, Department of Gastroenterology, Ann Arbor, USA, ⁵University of Pennsylvania School of Medicine, Department of Gastroenterology, Inflammatory Bowel Disease Center, Philadelphia, USA, ⁶Icahn School of Medicine at Mount Sinai, Department of Gastroenterology, New York City, USA

¹Hospital San Jorge, Surgery, Huesca, Spain, ²Hospital Germans Trias i Pujol, Gastroenterology, Badalona, Spain, ³Hospital Clínic, Gastroenterology, Barcelona, Spain, ⁴CIBERehd, Madrid, Spain, ⁵Hospital Reina Sofía, Gastroenterology, Córdoba, Spain, ⁶Hospital de la Princesa, Gastroenterology, Madrid, Spain, ⁷Hospital Clínico San Carlos, Gastroenterology, Madrid, Spain, ⁸Hospital Universitario Puerta de Hierro, Gastroenterology, Madrid, Spain, ⁹Hospital Clínico de Valencia, Gastroenterology, Valencia, Spain, ¹⁰Hospital Universitari de Bellvitge, Gastroenterology, L'Hospitalet de Llobregat, Spain, ¹¹Hospital Ramón y Cajal, Gastroenterology, Madrid, Spain, ¹²Hospital Marqués de Valdecilla, Gastroenterology, Santander, Spain, ¹³Hospital Politècnic La Fe, Gastroenterology, Valencia, Spain, ¹⁴Hospital Clínico Lozano Blesa, Gastroenterology, Zaragoza, Spain, ¹⁵Hospital Río Hortega, Gastroenterology, Valladolid, Spain, ¹⁶Hospital Universitario Central de Asturias, Gastroenterology, Ovideo, Spain, ¹⁷Hospital La Paz, Gastroenterology, Madrid, Spain, ¹⁸Hospital de la Santa Creu i Sant Pau, Gastroenterology, Barcelona, Spain, ¹⁹Hospital Universitario Miguel Servet, Gastroenterology, Zaragoza, Spain, ²⁰Complejo Hospitalario Universitario de Vigo, Gastroenterology, Vigo, Spain, ²¹Hospital Parc Taulí, Gastroenterology, Sabadell, Spain, ²²Hospital Clínico Virgen de la Victoria, Gastroenterology, Málaga, Spain, ²³Mútua de Terrassa, Gastroenterology, Terrassa, Spain, ²⁴Complejo Hospitalario Universitario de Burgos, Gastroenterology, Burgos, Spain, ²⁵Hospital Parc del Mar, Gastroenterology, Barcelona, Spain, ²⁶Hospital Clínico Universitario de Valladolid, Gastroenterology, Valladolid, Spain, ²⁷Consorci Sanitari de Terrassa, Gastroenterology, Terrassa, Spain, ²⁸Hospital Universitario Fuenlabrada, Gastroenterology, Fuenlabrada, Spain, ²⁹Hospital General Universitario de Alicante, Gastroenterology, Alicante, Spain, ³⁰Hospital Dr. Josep Trueta, Gastroenterology, Girona, Spain, ³¹Hospital 12 de Octubre, Gastroenterology, Madrid, Spain, ³²Hospital de Manises, Gastroenterology, Manises, Spain, ³³Hospital Universitario Fundación de Alcorcón, Gastroenterology, Alcorcón, Spain, ³⁴Hospital de Donostia, Gastroenterology, Donostia, Spain, ³⁵Hospital Universitario de Salamanca, Gastroenterology, Salamanca, Spain, ³⁶Hospital General de Ciudad Real, Gastroenterology, Ciudad Real, Spain, ³⁷Hospital General Universitario de Elche, Gastroenterology, Elche, Spain, ³⁸Hospital Moisès Broggi, Gastroenterology, Sant Joan Despí, Spain, ³⁹Hospital de Galdakao, Gastroenterology, Galdakao, Spain, ⁴⁰Hospital San Jorge, Gastroenterology, Huesca, Spain, ⁴¹Hospital de Torrejón, Gastroenterology, Torrejón de Ardoz, Spain, ⁴²Hospital Nuestra Señora de la Candelaria, Gastroenterology, Santa Cruz de Tenerife, Spain, ⁴³Complejo Hospitalario de Navarra, Gastroenterology, Pamplona, Spain, ⁴⁴Hospital General Universitario de Valencia, Gastroenterology, Valencia, Spain, ⁴⁵Hospital General de Tomelloso, Gastroenterology, Tomelloso, Spain, ⁴⁶Hospital Virgen de la Macarena, Gastroenterology, Sevilla, Spain, ⁴⁷Hospital General de Castelló, Gastroenterology, Castelló, Spain, ⁴⁸Hospital de Cruces, Gastroenterology, Barakaldo, Spain, ⁴⁹Hospital Son Llàtzer, Gastroenterology, Mallorca, Spain, ⁵⁰Hospital Universitario de Áraba, Gastroenterology, Vitoria, Spain, ⁵¹Hospital Royo Villanova, Gastroenterology, Zaragoza, Spain, ⁵²Hospital Sant Joan de Déu - Althaia, Gastroenterology, Manresa, Spain, ⁵³Hospital de Basurto, Gastroenterology, Basurto, Spain, ⁵⁴Hospital Universitario de Canarias, Gastroenterology, La Laguna, Spain, ⁵⁵Hospital de Viladecans, Gastroenterology, Viladecans, Spain, ⁵⁶Hospital Mancha Centro, Gastroenterology, Alcázar de San Juan, Spain, ⁵⁷Complejo Hospitalario Universitario de Santiago, Gastroenterology, Santiago de Compostela, Spain, ⁵⁸Hospital Universitari Arnau de Vilanova, Gastroenterology, Lleida, Spain

¹Sheba Medical Center and Sackler School of Medicine, Gastroenterology, Tel Hashomer, Israel, ²Sheba Medical Center, Department of Radiology, Tel Hashomer, Israel, ³Sharei Zedek Medical Center, Department of Gastroenterology, Jerusalem, Israel, ⁴Ben-Gurion University of the Negev and Soroka Medical Center, Department of Gastroenterology, Beer-Sheva, Israel, ⁵Tel Aviv Sourasky Medical Center, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, IBD Center, Department of Gastroenterology and Liver Diseases, Tel Aviv, Israel, ⁶Rambam Health Care Campus and Bruce Rappaport School of Medicine, Technion Institute of Technology, Department of Gastroenterology, Haifa, Israel

¹University Bern, Maurice E Müller Laboratories, Universitätsklinik für Viszerale Chirurgie und Medizin, Inselspital, Bern, Switzerland, ²Clinic for Visceral Surgery and Medicine, Gastroenterology, Bern, Switzerland