¹University of Padova, Department of Medicine, Padova, Italy, ²University of Padova, Department of Surgical, Oncological and Gastroenterological Sciences, Padova, Italy, ³Azienda Ospedaliera di Padova, UOC Gastroenterologia, Padova, Italy, ⁴Azienda Ospedaliera di Padova, UOSD Progetti e Ricerca Clinica, Padova, Italy

¹Henry Dunant Hospital Center, Athens, Greece, ²‘Evangelismos-Ophthalmiatreion Athinon-Polykliniki’ Hospital of Athens, Athens, Greece, ³‘Tzaneio’ General Hospital of Piraeus, Piraeus, Greece, ⁴National and Kapodistrian University of Athens, Athens, Greece

¹University of Padova, Department of Medicine, Padova, Italy, ²University of Padova, Department of Cardiac, Thoracic and Vascular Sciences, Padova, Italy, ³University of Padova, Department of Surgical, Oncological and Gastroenterological Sciences, Padova, Italy, ⁴Azienda Ospedaliera di Padova, UOC Gastroenterologia, Padova, Italy, ⁵Azienda Ospedaliera di Padova, UOSD Progetti e Ricerca Clinica, Padova, Italy

¹São Paulo State University (Unesp), Medical School, Botucatu, Internal Medicine, Botucatu, São Paulo, Brazil, ²São Paulo State University (Unesp), Medical School, Botucatu, Nursing, Botucatu, Sao Paulo, Brazil, ³São Paulo State University (Unesp), Medical School, Botucatu, Surgery, Botucatu, São Paulo, Brazil

¹Linköping university, Department of Gastroenterology and Department of Clinical and Experimental Medicine, Linköping, Sweden, ²Linköping university, Unit for Health Analysis and Department of Medical and Health Sciences, Linköping, Sweden, ³Linköping University, Department of Anaesthesiology and Intensive Care, and Department of Medical and Health Sciences, Linköping, Sweden, ⁴Linköping University, Department of Gastroenterology and Department of Clinical and Experimental Medicine, Linköping, Sweden

¹Tampere University Hospital, Hatanpää, Tampere, Finland, ²Tamperee University Hospital, Gastroenterology, Tampere, Finland, ³University of Helsinki and Helsinki University Hospital, Helsinki, Finland

¹Kinshukai Infusion Clinic, Osaka, Japan, ²Osaka University Graduate School of Medicine, Department of Gastroenterology and Hepatology, 2-2 Yamadaoka, Suita, Japan

NHS Highland, Gastroenterology, Inverness, UK

Meyer Children’s Hospital, Pediatric Gastrenterology and Nitrition Unit - Day Hospital, Florence, Italy

¹Henry Dunant Hospital Center, Athens, Greece, ²‘Evangelismos-Ophthalmiatreion Athinon-Polykliniki’ Hospital of Athens, Athens, Greece, ³‘Tzaneio’ General Hospital of Piraeus, Piraeus, Greece, ⁴University College London, London, UK, ⁵National and Kapodistrian University of Athens, Athens, Greece

The Children's Memorial Health Institute, Department of Gastroenterology, Hepatology, Feeding disorders and Pediatrics, Warsaw, Poland

Klinikum der Universität München, Medizinische Klinik und Poliklinik II, Munich, Germany

¹Emergency County Hospital Saint Spiridon, Institute of Gastroenterology and Hepatology, Iasi, Romania, ²"Gr.T.Popa" University of Medicine and Pharmacy, Gastroenterology, Iasi, Romania, ³Institute of Gastroenterology and Hepatology, Gastroenterology, Iasi, Romania

¹Rabin medical center, Division of Gastroenterology, Petah Tikva, Israel, ²The Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel, ³Tel Aviv Sourasky Medical Center, Department of Orthopedics, Tel Aviv, Israel, ⁴Department of Nursing, Tel Aviv University, Tel Aviv, Israel, ⁵Felsenstein Medical Research Center, Rabin Medical Center, Petah Tikva, Israel

¹Dorset County Hospital Foundation Trust, Gastroenterology, Dorchester, UK, ²Dorset County Hospital Foundation Trust, Gastroenterology, Dorchester, UK

¹Hamilton Health Sciences, Digestive Disease, Hamilton, Canada, ²Halton Healthcare, Oakville, Canada, ³QEII Health Sciences Centre, Halifax, Canada, ⁴Inomar Strategies, Oakville, Canada, ⁵Robarts Clinical Trials, London, Canada, ⁶London Health Sciences Centre, London, Canada, ⁷Red Deer Regional Hospital, Red Deer, Canada, ⁸McMaster University, Hamilton, Canada, ⁹King's College London, Waterloo, UK

Antrim Area Hospital, Gastroenterolgy, Antrim, UK

¹St. Mark's Hospital, IBD Unit, Harrow, UK, ²University College London Hospital, IBD Unit, London, UK, ³St. Mark's Hospital, IBD Unit, London, UK, ⁴Royal Free Hospital, IBD Unit, London, UK, ⁵Homerton University Hospital, Department of Gastroenterology, London, UK, ⁶Guy's and St. Thomas Hospital, IBD Unit, London, UK, ⁷King's College Hospital, IBD Unit, London, UK

University Hospital Galway, Gastroenterology, Galway, Ireland

¹Izmir Katip Celebi University, Faculty of Medicine, Internal Medicine Department, Izmir, Turkey, ²Izmir Katip Celebi University, Health Science Faculty, Nursing Department, Izmir, Turkey, ³Ege University, Faculty of Nursing, Department of Internal Medicine Nursing, Izmir, Turkey