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

¹Alexandria University, Gastroenterology, Alexandria, Egypt, ²Alexandria University, Clinical Pathology, Alexandria, Egypt, ³Alexandria University, Radiodiagnosis, Alexandria, Egypt

¹Weill Cornell Medicine, New York, USA, ²Cincinnati Children's Hospital Medical Center, Cincinnati, USA, ³University of North Carolina School of Medicine, Chapel Hill, USA, ⁴Seattle Children's, Seattle, USA, ⁵Nationwide Children's Hospital, Columbus, USA, ⁶Boystown National Research Hospital, Boystown, USA, ⁷University of Vermont College of Medicine, Burlington, USA

¹La Fe University and Polithecnic Hospital/CIBEREHD, Gastroenterology-IBD Unit, Valencia, Spain, ²IIS La Fe-Health Research Foundation Hospital/CIBEREHD, Gastroenterology-IBD Unit, Valencia, Spain, ³IIS La Fe-Health Research Foundation Hospital, Biostatistics Unit, Valencia, Spain

¹University Hospitals Leuven, Department of Gastroenterology, Leuven, Belgium, ²Imelda GI Clinical Research Center, Department of Gastroenterology, Bonheiden, Belgium, ³Sapporo Medical University, Department of gastroenterology, Sapporo, Japan, ⁴Pentax Medical, Product development department, Tokyo, Japan

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

Yokkaichi Hazu Medical Centre, Inflammatory Bowel Disease Centre, Yokkaichi, Japan

¹Janssen Scientific Affairs, LLC, Horsham, USA, ²CK Consulting Associates, LLC, Saint Helena Island, USA

¹St Mark's Hospital, Colorectal Surgery, London, UK, ²St Mark's Hospital, Gastrointestinal Imaging, London, UK, ³St Mark's Hospital, IBD/Physiology, London, UK

¹St Mark's hospital and Academic institute, Cancer and Surgery, London, UK, ²Northwest Thames Regional Genetic Service, London, UK

¹Mater Dei Hospital, Msida, Malta, ²Medical School and University Hospital of Ioannina, Department of Gastroenterology and Hepatology, Ioannina, Greece, ³Venizeleio General Hospital, Department of Gastroenterology, Crete, Greece, ⁴Evangelismos Hospital, Department of Gastroenterology, Athens, Greece, ⁵Sheba Medical Center, Department of Gastroenterology, Tel Hashomer, Israel, ⁶University Hospital Heraklion, Department of Gastroenterology, Crete, Greece, ⁷University of Szeged, First Department of Internal Medicine, Szeged, Hungary

¹Clinical Hospital Dubrava, Department of Gastroenterology and Hepatology and Clinical nutrition, Zagreb, Croatia, ²University Hospital Dubrava, Department for Diagnostic and Interventional Radiology, Zagreb, Croatia, ³University Hospital Dubrava, Department of Gastroenterology and Hepatology and Clinical Nutrition, Zagreb, Croatia

¹Hospital Universitario de Bellvitge, Gastroenterology, L´Hospitalet de Llobregat, Spain, ²Hospital Universitario de Bellvitge, Pharmacy, L´Hospitalet de LLobregat, Spain, ³Universitat de Barcelona, Pharmacy and pharmaceutical technology, Barcelona, Spain, ⁴Hospital Universitario de Bellvitge, Immunology, L´Hospitalet de LLobregat, Spain

¹Queen Elizabeth Hospital, Medicine, Hong Kong, Hong Kong, ²St Mark's Academic Institute, IBD Unit, Harrow, UK, ³The Chinese University of Hong Kong, Medicine and Therapeutics, Hong Kong, Hong Kong

¹Hospital Alvaro Cunqueiro, Complexo Hospitalario Universitario de Vigo, Instituto de Investigación Biomédica Galicia Sur, Estrutura Organizativa de Xestión Integrada de Vigo, Gastroenterology, Vigo, Spain, ²Hospital Meixoeiro, Complexo Hospitalario Universitario de Vigo, Instituto de Investigación Biomédica, Galicia Sur, Estrutura Organizativa de Xestión Integrada de Vigo, Laboratory, Vigo, Spain, ³Hospital Alvaro Cunqueiro, Complexo Hospitalario Universitario de Vigo, Instituto de Investigación Biomédica, Pathology, Vigo, 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

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

¹"Dana-Dwek" Children's Hospital, affiliated to the Sackler Faculty of Medicine, Tel Aviv University, The Pediatric Gastroenterology unit, Tel Aviv, Israel, ²Hematology Laboratories, Tel Aviv Medical Center, Tel Aviv, Israel, ³Hematology Laboratories Tel Aviv Sourasky Medical Center, Tel Aviv, Israel, ⁴Dana Dwek Children's Hospital, Pediatric department, Tel Aviv, Israel

¹Kyushu University, Medicine and Clinical Science, Fukuoka, Japan, ²Iwate Medical University, Internal Medicine, Morioka, Japan, ³Toho University, Sakura Medical Centre, Internal Medicine, Chiba, Japan

¹Sant'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