¹Hospital Santa Maria, Gastrenterology, Lisbon, Portugal, ²Hospital Santo António, Gastrenterology, Porto, Portugal

¹National and Kapodistrian University of Athens, Laiko General Hospital, Academic Department of Gastroenterology, Athens, Greece, ²National and Kapodistrian University of Athens, First Department of Pathology, Athens, Greece, ³on behalf of the Greek Vedolizumab Study group, Athens, Greece

Inje University College of Medicine, Internal Medicine, Seoul, South Korea

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

Sant'Orsola - Malpighi Hospital, Alma Mater Studiorum University of Bologna, Surgery of the Alimentary Tract, Department of Medical and Surgical Sciences, Bologna, Italy, ²Sant'Orsola - Malpighi Hospital, Alma Mater Studiorum University of Bologna, IBD Unit, Department of Medical and Surgical Sciences, Bologna, Italy

¹Oxford University Hospitals (OUH), Department of Gastroenterology, Oxford, UK, ²Oxford University Hospitals (OUH), Department of Obstetrics and Gynaecology, Oxford, UK, ³Oxford University Hospitals (OUH), Nuffield Department of Medicine, Oxford, UK

Toho University Sakura Medical Centre, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Sakura, Japan

The Jikei University School of Medicine, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Tokyo, Japan

Med Taher Maamouri Hospital, GastroEnterology Department, Nabeul, Tunisia

¹Hospital Universitario de La Princesa, Gastroenterology Unit, Madrid, Spain, ²Instituto de Investigación Sanitaria Princesa (IIS-IP), Madrid, Spain, ³Universidad Autónoma de Madrid, Madrid, Spain, ⁴Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain, ⁵Hospital Clinic Barcelona, Gastroenterology Unit, Barcelona, Spain, ⁶Hospital Universitario Reina Sofía, Gastroenterology Unit, Córdoba, Spain, ⁷IMIBIC, Córdoba, Spain, ⁸Hospital Clínico San Carlos, Gastroenterology Unit, Madrid, Spain, ⁹Hospital Universitario Germans Trias i Pujol, Gastroenterology Unit, Badalona, Spain, ¹⁰Hospital Universitario Puerta de Hierro, Gastroenterology Unit, Madrid, Spain, ¹¹Hospital Clínico Universitario de Valencia, Gastroenterology Unit, Valencia, Spain, ¹²Hospital Universitario Virgen Macarena, Gastroenterology Unit, Sevilla, Spain, ¹³Complejo Hospitalario Universitario de Vigo, Gastroenterology Unit, Vigo, Spain, ¹⁴Hospital Clínico Universitario Lozano Blesa, Gastroenterology Unit, Zaragoza, Spain, ¹⁵Hospital Universitario Ramón y Cajal, Gastroenterology Unit, Madrid, Spain, ¹⁶Hospital Universitario de Marqués de Valdecilla, Gastroenterology Unit, Santander, Spain, ¹⁷Hospital Universitario de Bellvitge, Gastroenterology Unit, Hospitalet de Llobregat, Spain, ¹⁸Hospital Universitario La Paz, Gastroenterology Unit, Madrid, Spain, ¹⁹Hospital Universitario y Politécnico de La Fe, Gastroenterology Unit, Valencia, Spain, ²⁰Hospital Universitario Rio Hortega, Gastroenterology Unit, Valladolid, Spain, ²¹Hospital Universitario Central de Asturias, Gastroenterology Unit, Oviedo, Spain, ²²Hospital de La Santa Creu i Sant Pau, Gastroenterology Unit, Barcelona, Spain, ²³Consorcio Corporación Sanitaria Parc Taulí, Gastroenterology Unit, Sabadell, Spain, ²⁴Hospital Virgen de La Victoria, Gastroenterology Unit, Málaga, Spain, ²⁵Hospital Universitario de Burgos, Gastroenterology Unit, Burgos, Spain, ²⁶Hospital Universitario Miguel Servet, Gastroenterology Unit, Zaragoza, Spain, ²⁷Consorci Sanitari Terrassa, Gastroenterology Unit, Tarrasa, Spain, ²⁸Hospital del Mar, Gastroenterology Unit, Barcelona, Spain, ²⁹Hospital Clínico Universitario de Valladolid, Gastroenterology Unit, Valladolid, Spain, ³⁰Hospital General Universitario de Alicante, Gastroenterology Unit, Alicante, Spain, ³¹Hospital Universitario de Fuenlabrada, Gastroenterology Unit, Fuenlabrada, Spain, ³²Hospital Universitario Fundación Alcorcón, Gastroenterology Unit, Alcorcón, Spain, ³³Hospital de Manises, Gastroenterology Unit, Manises, Spain, ³⁴Hospital Universitario De Salamanca, Gastroenterology Unit, Salamanca, Spain, ³⁵Hospital Universitario de Gerona Dr Josep Trueta, Gastroenterology Unit, Gerona, Spain, ³⁶Hospital General Universitario de Elche, Gastroenterology Unit, Elche, Spain, ³⁷Hospital Universitario Donostia, Gastroenterology Unit, San Sebastián, Spain, ³⁸Hospital Universitario 12 de Octubre, Gastroenterology Unit, Madrid, Spain, ³⁹Hospital General Universitario de Ciudad Real, Gastroenterology Unit, Ciudad Real, Spain, ⁴⁰Complejo Hospitalario de Navarra, Gastroenterology Unit, Pamplona, Spain, ⁴¹Hospital Universitario Cruces, Gastroenterology Unit, Baracaldo, Spain, ⁴²Hospital de Galdakao-Usansolo, Gastroenterology Unit, Vizcaya, Spain, ⁴³Complejo Hospitalario la Mancha Centro, Gastroenterology Unit, Alcázar de San Juan, Spain, ⁴⁴Hospital General Universitario Santa Lucía, Gastroenterology Unit, Cartagena, Spain, ⁴⁵Hospital de Sant Joan Despí Moisès Broggi, Gastroenterology Unit, Sant Joan Despí, Spain, ⁴⁶Hospital General San Jorge, Gastroenterology Unit, Huesca, Spain, ⁴⁷Complejo Hospitalario de Palencia, Gastroenterology Unit, Palencia, Spain, ⁴⁸Hospital Universitario de Torrejón, Gastroenterology Unit, Torrejón de Ardoz, Spain, ⁴⁹Hospital Clínico Universitario de Santiago, Gastroenterology Unit, Santiago de Compostela, Spain, ⁵⁰Hospital Sant Joan de Deu - Althaia, Gastroenterology Unit, Manresa, Spain, ⁵¹Hospital Universitario de Canarias, Gastroenterology Unit, La Laguna, Spain, ⁵²Hospital Son Llàtzer, Gastroenterology Unit, Palma de Mallorca, Spain, ⁵³Hospital Público General de Tomelloso, Gastroenterology Unit, Tomelloso, Spain, ⁵⁴Hospital Universitario Nuestra Señora de Candelaria, Gastroenterology Unit, Santa Cruz de Tenerife, Spain, ⁵⁵Hospital General Universitario de Valencia, Gastroenterology Unit, Valencia, Spain, ⁵⁶Hospital Universitario Basurto, Gastroenterology Unit, Bilbao, Spain, ⁵⁷Hospital General Universitario de Castellón, Gastroenterology Unit, Castellón, Spain, ⁵⁸Hospital Royo Villanova, Gastroenterology Unit, Zaragoza, Spain, ⁵⁹Hospital Universitario Araba, Gastroenterology Unit, Vitoria, Spain, ⁶⁰Hospital Universitario Arnau de Vilanova, Gastroenterology Unit, Lérida, Spain, ⁶¹Hospital de Viladecans, Gastroenterology Unit, Viladecans, Spain, ⁶²Hospital Universitario Son Dureta, Gastroenterology Unit, Palma de Mallorca, Spain, ⁶³Hospital General de Granollers, Gastroenterology Unit, Granollers, Spain, ⁶⁴Hospital General de Segovia, Gastroenterology Unit, Segovia, Spain, ⁶⁵Complejo Hospitalario de Jaén, Gastroenterology Unit, Jaén, Spain, ⁶⁶Hospital Universitario Infanta Sofía, Gastroenterology Unit, San Sebastián de los Reyes, Spain, ⁶⁷Hospital Comarcal Sant Jaume de Calella, Gastroenterology Unit, Calella, Spain, ⁶⁸Hospital Marina Baixa, Gastroenterology Unit, Villajoyosa, Spain, ⁶⁹Hospital Santos Reyes, Gastroenterology Unit, Aranda de Duero, Spain, ⁷⁰Hospital Vega Baja, Gastroenterology Unit, San Bartolomé, Spain, ⁷¹Hospital Can Misses, Gastroenterology Unit, Ibiza, Spain, ⁷²Hospital Universitario Joan XXIII, Gastroenterology Unit, Tarragona, Spain, ⁷³Hospital Materno Infantil, Pediatric Gastroenterology and Nutrition Unit, Málaga, Spain, ⁷⁴Hospital Comarcal de la Axarquía, Vélez-Málaga, Spain

¹Mayo Clinic, Colon and Rectal Surgery, Rochester, USA, ²Mayo Clinic, Surgery, Rochester, USA, ³St. Mark's Hospital and Academic Institute, London, UK, ⁴Humanitas Research Institute, Milan, Italy

¹St Vincent's Hospital Melbourne, Department of Gastroenterology, Melbourne, Australia, ²The University of Melbourne, Melbourne, Australia, ³St Vincent's Hospital Melbourne, Department of Medical Imaging, Melbourne, Australia

"Dana-Dwek" Children's Hospital, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, The Pediatric Gastroenterology unit, Tel Aviv, Israel

¹Icahn School of Medicine at Mount Sinai, Department of Genetics and Genomic Sciences, New York, USA, ²Icahn School of Medicine at Mount Sinai, Department of Obstetrics, Gynecology and Reproductive Sciences, New York, USA, ³Icahn School of Medicine at Mount Sinai, Division of Pediatric Gastroenterology and Hepatology, New York, USA, ⁴TechLab, Blacksburg, USA, ⁵Calpro AS, Lysaker, Norway, ⁶Icahn School of Medicine at Mount Sinai, Division of Gastroenterology, Department of Medicine, New York, USA, ⁷Hospital Beatriz Ângelo, Gastroenterology Division, Loures, USA

¹CHU Nantes, Gastroenterology - IMAD, Nantes, France, ²Polytech Nantes Engineering School, Nantes 44000, France, ³CHU Nantes IMAD, Gastroenterology, Nantes 44000, France

Peking University Third Hospital, Department of Gastroenterology, Beijing, China

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, ³Queen Elizabeth Hospital, Department of Medicine, Hong Kong, Hong Kong, ⁴Inflammatory Bowel Disease Center University of Chicago Medicine, Chicago, USA, ⁵University Hospital, Biostatistics Unit, DRCI, Clermont-Ferrand, France, ⁶University of Chicago Medicine, Department of Pathology, Chicago, USA

Centro Hospitalar Tondela - Viseu, Gastroenterology, Viseu, 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