University of Palermo, Gastroenterology and Hepatology Section- PROMISE, Palermo, Italy

¹IRCCS Sacro Cuore Don Calabria, IBD Unit, Negrar di Valpolicella, Italy, ²University of L’Aquila, Gastroenterology Unit, L’Aquila, Italy, ³IRCCS Sacro Cuore Don Calabria, Medical Analysis Laboratory, Negrar di Valpolicella, Italy, ⁴IRCCS Sacro Cuore Don Calabria, Clinical Research Unit, Negrar di Valpolicella, Italy

¹Division of Gastroenterology, Department of Medicine- Ribeirão Preto Medical School- University of São Paulo, Ribeirao Preto, Brazil, ²Division of Clinical Immunology, Department of Medicine- Ribeirão Preto Medical School- University of São Paulo, Ribeirão Preto, Brazil, ³Division of Coloproctology, Department of Surgery and Anatomy, Ribeirão Preto, Brazil, ⁴Molecular Biology Laboratory, Department of Surgery and Anatomy, Ribeirão Preto, Brazil, ⁵Pathology, Department of Pathology- Ribeirão Preto Medical School- University of São Paulo, Ribeirão Preto, Brazil

¹Grantham District General Hospital and United Lincolnshire Hospitals NHS Trust, Gastroenterology., Ickenham, UK, ²Foundation Traineee, Medicine, London, UK

¹Hospital de Santarém, Obstetrícia e Ginecologia, Santarém, Portugal, ²Instituto Português de Oncologia de Lisboa, Gastrenterologia, Lisboa, Portugal, ³Hospital de Santa Maria, Gastrenterologia, Lisboa, Portugal, ⁴Hospital de Santa Maria, Obstetrícia e Ginecologia, Lisboa, Portugal

¹IRCCS Sacro Cuore Don Calabria, IBD Unit, Negrar di Valpolicella, Italy, ²University of L’Aquila, Gastroenterology Unit, L’Aquila, Italy, ³IRCCS Sacro Cuore Don Calabria, Clinical research Unit, Negrar di Valpolicella, Italy, ⁴IRCCS Sacro Cuore Don Calabria, Medical Analysis Laboratory, Negrar di Valpolicella, Italy

¹Hospital da Senhora da Oliveira, Gastroenterology Department, Guimarães, Portugal, ²PT Government Associate Laboratory, ICVS/3B’s, Braga/Guimarães, Portugal, ³University of Minho, Life and Health Sciences Research Institute ICVS- School of Medicine, Braga, Portugal

Changi General Hospital- Singapore, Gatroenterology and Hepatology, Singapore, Singapore

¹Hospital General Universitario Alicante, Department of Gastroenterology- CIBERehd, Alicante, Spain, ², Gastroenterology, Alicante, Spain

Tel Aviv Sourasky Medical Center, Surgical Division, Tel Aviv, Israel

¹Hospital Infantil Universitario Niño Jesús, Department of Gastroenterology and Nutrition, Madrid, Spain, ²Hospital Infantil Universitario Niño Jesús, Department of Pediatrics, Madrid, Spain

Pirogov Russian National Research Medical University, Faculty of Pediatrics, Moscow, Russian Federation

¹National Institute of Medical Science and Nutrition Salvador Zubiran, Department of Gastroenterology, Mexico City, Mexico, ²IBD Clinic- Department of Gastroenterology- Instituto Nacional de Ciencias Medicas y Nutricion, Gastroenterology, Mexico, Mexico, ³Instituto Nacional de Psiquiatría Ramon de la Fuente Muñiz, Epidemiology, Mexico, Mexico

¹Marqués de Valdecilla University Hospital., Gastroenterology, Santander- Cantabria, Spain, ²Investigation Institute Marques de Valdecilla- IDIVAL, Infection- Immunity and Digestive Diseases Group, Santander- Cantabria, Spain, ³Marqués de Valdecilla University Hospital, Pathology, Santander- Cantabria, Spain

¹IBUS studygroup, 1Hvidovre Hospital-, Gastrounit- Division of Medicine, Copenhagen, Denmark, ²Haukeland University Hospital, Department of medicine, Bergen, Norway, ³University Teaching Hospital Lueneburg., Department of Internal Medicine and Gastroenterology-, Lueneburg, Germany, ⁴Amsterdam University Medical Centers, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ⁵University Teaching Hospital Lueneburg, Outpatients Department of Gastroenterology, Lueneburg, Germany, ⁶’Luigi Sacco’ University Hospital- University of Milan, Gastroenterology Unit- Department of Biomedical and Clinical Sciences, Milan, Italy, ⁷Humanitas University, Department of Gastroenterology, Milan, Italy, ⁸University of Calgary, Department of Medicine- Division of Gastroenterology, Calgary, Canada, ⁹Hospital Beatriz Ângelo, Gastroenterology Department, Loures, Portugal, ¹⁰The Royal Melbourne Hospital, Gastroenterology Department, Melbourne, Australia

¹Sheba Medical Center Tel Hashomer, Gastroenterology Institute, Ramat gan, Israel, ²Tel-Aviv University, Sackler School of Medicine, Tel Aviv, Israel, ³ISCARE I.V.F. a.s ibd, IBD Clinical and Research Centre, Prague, Czech Republic, ⁴University Medical Centre Ljubljana, Department of Gastroenterology, Ljubljana, Slovenia, ⁵Rambam Health Care Campus, Bruce and Ruth Rappaport Faculty of Medicine, Haifa, Israel, ⁶University Hospital of Saint-Etienne, Department of Hepatogastroenterology, Saint-Etienne, France, ⁷University of Porto, Department of Biomedicine- Unit of Pharmacology and Therapeutics- Faculty of Medicine, Porto, Portugal, ⁸University of Lisbon, Instituto de Saúde Ambiental- Faculty of Medicine, Lisbon, Portugal, ⁹University of Ljubljana, Medical Faculty, Ljubljana, Slovenia

University of Liverpool, Biostatistics, Liverpool, UK

¹St Mark’s Hospital, Department of Gastroenterology, London, UK, ²National Institute for Health Research, Applied Research Collaborations, London, UK, ³Patient Information Forum, Head of Strategy and Partnership, London, UK

¹Department of Gastroenterology and Hepatology, Amsterdam UMC – Location AMC, Amsterdam, The Netherlands, ²Department of Gastroenterology and Hepatology, University Medical Center Ljubljana, Ljubljana, The Netherlands

Barts Health, Gastroenterology, London, UK