¹Bern University Hospital, Gastroenterology, Bern, Switzerland, ²Bern University Hospital, University Institute of Clinical Chemistry, Bern, Switzerland, ³Bern University Hospital, Maurice E Müller Laboratories, Bern, Switzerland

¹Hospital Infantil Universitario Niño Jesús, Gastroenterology and Nutrition, Madrid, Spain, ²Hospital Infantil Universitario Niño Jesús, Clinical Analysis Department, Madrid, Spain, ³Hospital Infantil Universitario Niño Jesús, Pediatric Intensive Care Unit, Madrid, Spain

¹BÜHLMANN Laboratories AG, Schoenenbuch, Switzerland, ²Faculty of Medicine, University of Porto, Department of Biomedicine, Unit of Pharmacology and Therapeutics, Porto, Portugal

¹Tzaneion General Hospital of Piraeus, Department of Gastroenterology, Piraeus, Greece, ²School of Medicine, National and Kapodistrian University of Athens, Department of Basic Medical Sciences, Laboratory of Biology, Athens, Greece, ³School of Medicine, National and Kapodistrian University of Athens, 2 Department of Surgery, Athens, Greece, ⁴School of Medicine, National and Kapodistrian University of Athens, Gastroenterology Unit, 2 Department of Surgery, Athens, Greece

¹Amsterdam UMC, Department of Surgery and Gastroenterology, Amsterdam, The Netherlands, ²Amsterdam UMC, Department of Surgery, Amsterdam, The Netherlands, ³Amsterdam UMC, Department of Pathology, Amsterdam, The Netherlands

¹Hospital Beatriz Ângelo, Gastroenterology, Loures, Portugal, ²Mater Dei Hospital, Malta, Malta, ³Faculty of Sciences of Lisbon University, Lisboa, Portugal, ⁴Hospital Beatriz Ângelo, Lisboa, Portugal, ⁵Hospital CUF Descobertas, Lisboa, Portugal, ⁶Hospital Prof. Doutor Fernando Fonseca, Amadora, Portugal, ⁷Centro Hospitalar Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal, ⁸Centro Hospitalar de Setúbal, Setúbal, Portugal, ⁹Hospital da Senhora de Oliveira - Guimarães, Guimarães, Portugal, ¹⁰Hospital Garcia de Orta, Almada, Portugal

¹Children's Hospital Zagreb, Zagreb, Croatia

¹Instituto Hospital de Base, Coloproctology, Brasilia, Brazil, ²Instituto Hospital de Base, Nuclear Medicine, Brasília, Brazil, ³Hospital Regional da Asa Norte, Rheumatology, Brasilia, Brazil, ⁴Instituto Hospital de Base, Pathology, Brasilia, Brazil

¹Gastroenterology and Endoscopy Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy, ²IBD Unit, Department of Medical and Surgical Sciences (DIMEC), Policlinico S.Orsola-Malpighi, University of Bologna, Bologna, Italy, ³Gastroenterology and Digestive Endoscopy Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy, ⁴Department of Biomedical Sciences for Health, University of Milan, Milan, Italy, ⁵Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy

¹Royal Infirmary of Edinburgh, Edinburgh, UK, ²St Mark's Hospital, Harrow, UK, ³Complejo Hospitalario de Navarra, Navarra, Spain

¹IBD Clinic, Department of Gastroenterology, Instituto Nacional de Ciencias Medicas y Nutricion, Gastroenterology, Mexico, Mexico, ²National Institute of Psychiatry Ramón de la Fuente Muñíz, Sub-direction of Clinical Research, Mexico, Mexico, ³Instituto Nacional de Ciencias Medicas y Nutricion, Psychiatry, Mexico, Mexico

¹Kazan State Medical University, Hospital Therapy, Kazan, Russian Federation, ²Volga Region State Academy of Physical Culture, Sport and Tourism, Science Center, Kazan, Russian Federation, ³Kazan State Medical University, Hospital therapy, Kazan, Russian Federation

¹Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy, ²Institute Giannina Gaslini, Pediatric Gastroenterology and Endoscopy Unit,, Genoa, Italy, ³Children’s Hospital Bambino Gesù, Department of Pediatrics, Rome, Italy, ⁴Children’s Hospital Bambino Gesù, Digestive diseases Unit, Rome, Italy, ⁵Institute Giannina Gaslini, Pediatric Hematology-Oncology Unit, Genoa, Italy, ⁶Sapienza University of Rome, Pediatric Gastroenterology And Liver Unit, Rome, Italy, ⁷University of Messina, Pediatric Gastroenterology and Cystic Fibrosis Unit, Messina, Italy, ⁸Azienda Ospedaliera-Universitaria Città della Salute e della Scienza di Torino, Pediatric Gastroenterology Unit, Turin, Italy

¹Our Lady of Lourdes Hospital, Drogheda, Department of Gastroenterology and Clinical Medicine, Drogheda, Ireland

¹Hospital Universitari Vall d'Hebron, Servicio Digestivo, Barcelona, Spain, ²Hospital Universitario Son Espases, Servicio Digestivo, Palma de Mallorca, Spain, ³Hospital Universitario Miguel Servet, Servicio Digestivo, Zaragoza, Spain, ⁴Hospital Universitario Puerta de Hierro-Majadahonda, Unidad Enfermedad Inflamatoria Intestinal, Madrid, Spain, ⁵Hospital Universitario Virgen Macarena, Aparato Digestivo, Sevilla, Spain, ⁶Hospital Clínico Universitario de Santiago de Compostela, Unidad Enfermedad Inflamatoria Intestinal, Santiago de Compostela, Spain, ⁷Hospital Universitario Germans Trias i Pujol, Badalona, Unidad Enfermedad Inflamatoria Intestinal, Badalona, Spain, ⁸La Mina Primary Care Centre, Sant Adrià de Besós, Spain, ⁹ACCU España, Gerencia, Madrid, Spain

¹La Rabta Hospital, Gastroenterology B, Tunis, Tunisia

¹Unitat Atenció Crohn-Colitis, Hospital Universitari Vall d'Hebron, Barcelona, Spain

¹Nordic Biosciene A/S, Biomarkers & Research, Herlev, Denmark, ²University of Southern Denmark and Odense University Hospital, Department of Medical Gastroenterology, Odense, Denmark

¹Centre for Health Economics, Department of economics, University of Gothenburg, Gothenburg, Sweden, ²University Hospital CHU of Liège Belgium, Department of Gastroenterology, Liège, Belgium, ³Skane University Hospital, Lund, Department of Gastroenterology, Lund, Sweden

¹Tokyo Women’s Medical University, Tokyo, Japan