¹Icahn School of Medicine at Mount Sinai- New York, The Dr Henry D. Janowitz Division of Gastroenterology, New York, USA, ²Hospital and University Center of Coimbra – Portugal, Division of Gastroenterology, Coimbra, Portugal, ³Icahn School of Medicine at Mount Sinai – New York, Levy Library, New York, USA

¹Department of General Surgery, Maastricht University Medical Center, Maastricht, The Netherlands, ²Department of Gastroenterology, University Medical Center Groningen, Groningen, The Netherlands, ³Department of General Surgery, University Medical Center Groningen, Groningen, The Netherlands, ⁴Department of General Surgery, Amsterdam University Medical Centre, Amsterdam, The Netherlands

¹Department of Gastroenterology, University of California San Diego, San Diego, USA, ²Department of Gastroenterology, University of Western Ontario, London, Canada, ³Department of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, USA, ⁴Department of Gastroenterology, Takeda Pharmaceuticals, Deerfield, USA

¹Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece, ²Department of Gastroenterology, University Hospital Heraklion, Heraklion, Greece, ³Department of Gastroenterology, Medical School of National and Kapodistrian University -–General Hospital ‘Laiko’, Athens, Greece, ⁴Department of Gastroenterology, Alexandra General Hospital, Athens, Greece, ⁵Department of Gastroenterology, University Hospital Larissa, Larissa, Greece, ⁶Department of Gastroenterology, Sotiria Hospital, Athens, Greece, ⁷Department of Gastroenterology, Tzaneio General Hospital, Piraeus, Greece, ⁸Department of Gastroenterology, Metaxa General Hospital, Piraeus, Greece, ⁹Department of Gastroenterology, Hippokration General Hospital,Thessaloniki, Greece, ¹⁰Department of Surgery, Aretaieion University Hospital, Athens, Greece

¹Department of Internal Medicine, Division of Gastroenterology, selcuk Universitesi Selcuklu Tip Fak, Konya, Turkey, ²Department of Internal Medicine, Selcuk University Medical School, Konya, Turkey

¹Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy, ²Department of Experimental and Clinical Medicine – Florence, University of Florence, Florence, Italy, ³Department of experimental and Clinical Medicine, University of Florence, Fiesole, Italy

¹Bagcilar Education and Research Hospital, Gastroenterology, Istanbul, Turkey, ²Bagcilar Education and Research Hospital, Internal Medicine, Istanbul, Turkey, ³Sisli Education and Research Hospital, Radiology, Istanbul, Turkey, ⁴School of Nursing, Halic University, Istanbul, Turkey, ⁵Okmeydani Education and Research Hospital, Internal Medicine, Istanbul, Turkey, ⁶Faculty of Medicine, Gastroenterology, Mersin University, Istanbul, Turkey

¹Department of Gastroenterology, John Hunter Hospital, Newcastle, Australia, ²Department of Clinical Trials, Robarts Clinical Trials Inc., London, Canada, ³Department of Gastroenterology, The Queen Elizabeth Hospital, Adelaide, Australia

¹Unit for Clinical Nutrition, Department of Gastroenterology and Hepatology, Zagreb, Croatia, ²Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia, ³Department of Gastroenterology and Hepatology, Clinical Hospital Centre Zagreb, Zagreb, Croatia, ⁴Zagreb School of Medicine, University of Zagreb, Zagreb, Croatia

¹Complejo Hospitalario Universitario de Ferrol, Gastroenterology, Ferrol, Spain, ²Complejo Hospitalario Universitario de Ferrol, Dermatology, Ferrol, Spain

¹Departmeng of Gastroenterology, Guy’s and St Thomas’ NHS Foundation Trust, London, UK, ²Viapath Laboratories, Guy’s and St Thomas’ NHS Foundation Trust, London, UK

¹Faculty of Medicine of Tunis, Gastroenterology A Rabta, Tunis, Tunisia, ²Rabta, Gastroenterology A, Tunis, Tunisia

¹Cogentia Healthcare Consulting, n/a, Cambridge, UK, ²Department of Medicine, University of Cambridge, Cambridge, UK, ³Department of Medical Affairs, PredictImmune Limited, Cambridge, UK

¹Department of Systems Medicine- Gastroenterology Unit, University of Rome ‘Tor Vergata’, Roma, Italy, ²Department of Systems Medicine- Psychiatric Unit, University of Rome ‘Tor Vergata’, Roma, Italy

¹St Mark’s Hospital, Gastroenterology, Harrow, UK, ²National Institute for Health Research, Applied Research Collaborations, Northwest London, UK, ³Crohns and Colitis UK, Publications and Information Manager, London, UK, ⁴Patient Information Forum, Head of Strategy and Partnership, London, UK

¹Patient Association, ACCU España, Madrid, Spain, ²Hospital Universitario Puerta de Hierro-Majadahonda, Inflammatory Bowel Disease Unit, Madrid, Spain, ³Hospital Universitario y Politécnico La Fe, Inflammatory Bowel Disease Unit, Valencia, Spain

St Mark’s Hospital and Academic Institute, Fistula Research Unit, London- Harrow, UK

¹Hospital Galdakao, Department of Gastroenterology, Galdakao, Spain, ²Hospital Universitario de Cruces, Gastroenterology, Barakaldo, Spain, ³Hospital Universitario Araba, Gastroenterology, Vitoria, Spain, ⁴Hospital Universitario Donostia, Gastroenterology, Donostia, Spain, ⁵Hospital de Mendaro, Gastroenterology, Mendaro, Spain, ⁶Hospital de San Eloy, Gastroenterology, Barakaldo, Spain, ⁷Onkologikoa, Gastroenterology, Donostia, Spain, ⁸Hospital de Mondragón, Gastroenterology, Mondragón, Spain, ⁹Hospital Universitario de Basurto, Gastroenterology, Bilbao, Spain, ¹⁰Hospital de Zumárraga, Gastroenterology, Zumárraga, Spain, ¹¹Hospital Bidasoa, Gastroenterology, Irún, Spain, ¹²Clínica Universidad de Navarra, Gastroenterology, Pamplona, Spain, ¹³Hospital Galdakao, Gastroenterology, Galdakao, Spain, ¹⁴Hospital Clínico Universitario de Santiago de Compostela, Gastroenterology, Santiago de Compostela, Spain

¹Department of Medicine, Dalhousie University, Halifax, Canada, ²Department of Digestive Care and Endoscopy, Nova Scotia Health Authority, Halifax, Canada, ³School of Health and Human Performance, Dalhousie University, Halifax, Canada, ⁴Department of Social Work, University of Toronto, Toronto, Canada

¹Department of Gastroenterology, General Hospital of Ioannina, Ioannina, Greece, ²Department of Gastroenterology, University Hospital of Ioannina, Ioannina, Greece