¹Erasmus Medical Center, Department Colorectal surgery, Rotterdam, The Netherlands, ²Ijsselland Hospital, Department Colorectal surgery, Capelle a/d Ijssel, The Netherlands, ³Bergman Clinics, Department Reconstructive surgery, Bilthoven, The Netherlands, ⁴Erasmus Medical Center, Department Gastroenterology, Rotterdam, The Netherlands

¹University of California San Diego, La Jolla, CA, USA, ²Henri Mondor University Hospital, Creteil, France, ³University of Lorraine, Nancy, France, ⁴Aix-Marseille University, Marseille, France, ⁵University of Western Ontario, London, ON, Canada, ⁶Nice University Hospital, Nice, France, ⁷Claude Huriez Hospital, Lille, France, ⁸Mayo Clinic, Rochester, MN, USA, ⁹University Hospital of Saint-Etienne, Saint-Etienne, France, ¹⁰Estaing University Hospital, Clermont-Ferrand, France, ¹¹Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA, ¹²Beaujon Hospital, Clichy, France, ¹³Takeda Pharmaceuticals U.S.A., Inc., Deerfield, IL, USA, ¹⁴Takeda Pharmaceuticals International AG, Zurich, Switzerland, ¹⁵University Hospital of Nantes, Nantes, France, ¹⁶Cleveland Clinic Foundation, Cleveland, OH, USA, ¹⁷University Hospital of Montpellier Saint-Eloi, Montpellier, France, ¹⁸Icahn School of Medicine at Mount Sinai, New York, NY, USA, ¹⁹Bicetre University Hospital, Paris, France, ²⁰Indiana University, Indianapolis, IN, USA, ²¹New York University (NYU), New York, NY, USA, ²²Saint-Antoine University Hospital, Paris, France, ²³Montefiore Medical Center, New York, NY, USA

¹Erasmus MC, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands, ²Erasmus MC, Department of Biostatistics, Rotterdam, The Netherlands

¹Bordeaux University Hospital, Gastroenterology and nutrition, Bordeaux, France, ²Bagatelle Health Center, Proctology, Bordeaux, France

¹University of Pisa, Department of New Technologies and Translational Sciences in Medicine And Surgery, Pisa, Italy, ²Pisa University Hospital, Department of General Surgery and Gastroenterology, Pisa, Italy

¹Robert Bosch Hospital, Department of Gastroenterology, Hepatology and Endocrinology, Stuttgart, Germany

¹University of Michigan, Internal Medicine, Ann Arbor, USA, ²Multicare Institute, Tacoma, USA, ³Arena Pharmaceuticals, San Diego, USA, ⁴Northwestern University, Chicago, USA, ⁵University of North Carolina, Chapel Hill, USA, ⁶University of Cincinnati, Cincinnati, USA

¹University of Edinburgh, Edinburgh, UK, ²Royal Infirmary of Edinburgh, Edinburgh, UK, ³Westen General Hospital, Edinburgh, UK, ⁴University of Oxford, Oxford, UK, ⁵Western General Hospital, Edinburgh, UK

¹Hospital Santa Maria, CHLN, Gastrenterology, Lisbon, Portugal

¹Centro Hospitalar Vila Nova de Gaia/Espinho, Gastroenterology, Vila Nova de Gaia, Portugal

¹Schlosspark Klinik, University Medicine Berlin, Head of Department of Internal Medicine II, Rheumatology, Clinical Immunology, Osteology Director of Rheumatology Research Center, Berlin, Germany, ²NDA Group, Leatherhead, Surrey, UK, ³Fujifilm Kyowa Kirin Biologics Co., Ltd., Clinical Development Department, Tokyo, Japan, ⁴Hammersmith Medicines Research, London, UK, ⁵Mylan Inc., Global Medical Affairs, Canonsburg, USA, ⁶Stanford University School of Medicine, James W. Raitt Endowed Professor of Medicine Co-Chief Division of Immunology and Rheumatology, Palo Alto, USA

¹Royal Liverpool University Hospital, Liverpool, UK, ²Institute of Translational medicine, Department of Biostatistics, Liverpool, UK

¹Hospital Universitari Germans Trias i Pujol, Gastroenterology Department, Badalona, Spain, ²CIBERehd, Madrid, Spain, ³Hospital Clínic, Barcelona, Spain, ⁴Hospital Reina Sofía, Córdoba, Spain, ⁵Hospital Puerta de Hierro, Majadahonda, Spain, ⁶Hospital de Bellvitge, L'Hospitalet del Llobregat, Spain, ⁷Hospital Clínico San Carlos, Madrid, Spain, ⁸Hospital La Fe de Valencia, Valencia, Spain, ⁹Hospital Ramón y Cajal, Madrid, Spain, ¹⁰Hospital La Paz, Madrid, Spain, ¹¹Hospital Clínico de Valencia, Valencia, Spain, ¹²Hospital Universitario de La Princesa, Madrid, Spain, ¹³H.U. Miguel Servet, Zaragoza, Spain, ¹⁴H.U. Central de Asturias, Oviedo, Spain, ¹⁵H. Clínico Lozano Blesa, Zaragoza, Spain, ¹⁶H. Parc Taulí, Sabadell, Spain, ¹⁷H. Santa Creu i Sant Pau, Barcelona, Spain, ¹⁸H.U. Marqués de Valdecilla, Santander, Spain, ¹⁹Complexo H.U. de Vigo, Vigo, Spain, ²⁰H. Virgen de la Macarena, Sevilla, Spain, ²¹H.U. Burgos, Burgos, Spain, ²²H. Río Hortega, Valladolid, Spain, ²³H. Mútua de Terrassa, Terrassa, Spain

¹Interdisciplinary Crohn Colitis Centre Rhein-Main, Frankfurt/Main, Germany, ²DGD Clinics Sachsenhausen, Frankfurt/Main, Germany, ³Immundiagnostik AG, Bensheim, Germany

¹Theagenion CHT, Gastroenterology Department, Thessaloniki, Greece, ²Theagenion CHT, Dir Haematology Lab, Thessaloniki, Greece

¹PGIMER, Gastroenterology, Chandigarh, India

¹Fukuoka University Chikushi Hospital, IBD Center, Fukuoka, Japan, ²Fukuoka University Chikushi Hospital, Department of Gastroenterology, Fukuoka, Japan, ³Fukuoka University Chikushi Hospital, Department of Endoscopy, Fukuoka, Japan

¹GHI Le Raincy-Montfermeil, Gastroenterology, Montfermeil, France, ²Hopital Cochin, Paris, Gastroenterology, Paris, France, ³Hopital de Dunkerque, Gastroenterology, Dunkerque, France

¹Monash Medical Centre, Gastroenterology, Melbourne, Australia, ²St Vincent's Hospital, Gastroenterology, Melbourne, Australia, ³St Vincent’s Hospital, Gastroenterology, Melbourne, Australia

¹Progenika Biopharma-Grifols, Derio, Spain