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

Tallaght University Hospital, Gastroenterology, Dublin, Ireland

Department of Gastroenterology, Istanbul University Cerrahpasa, Istanbul, Turkey

Department of Pediatric Gastroenterology, The Sainte-Justine University Hospital Centre, Montréal, Canada

¹Department of Gastroenterology, Rabin Medical Center, Petach Tikva, Israel, ²Institute of Pediatric Gastroenterology and Nutrition, Shaare Tzedek Medical Center, Jerusalem, Israel, ³Maccabi Health Services, Tel-Aviv, Israel, ⁴Medical Division, Meuhedet Sick Fund, Tel-Aviv, Israel, ⁵Leumit Health Fund, Leumit Health Fund, Tel-Aviv, Israel, ⁶Clalit Health Services, Clalit Research Institute, Tel-Aviv, Israel, ⁷Ministry of Health, Jerusalem, Israel

Department of Gastroenterology, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China

¹Department of Gastroenterology, Queen Elizabeth Hospital Birmingham, Birmingham, UK, ²St Mark’s Hospital, IBD Unit, Harrow, UK, ³Department of Gastroenterology, NHS Forth Valley, Stirling, UK, ⁴Department of Gastroenterology, Plymouth Hospitals NHS Trust, Plymouth, UK, ⁵Department of Gastroenterology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK, ⁶AbbVie Ltd., Medical, Maidenhead, UK, ⁷Department of Gastroenterology, Royal Devon and Exeter Hospital, Exeter, UK

¹Department of Gastroenterology, All India Institute of Medical Sciences, New Delhi, India, ²Department of GI Surgery, All India Institute of Medical Sciences, New Delhi, India

¹Department of Gastroenterology, NHS Greater Glasgow and Clyde, Glasgow, UK, ²Department of Gastroenterology, NHS Lanarkshire, Glasgow, UK

Institute of Gastroenterology, Nutrition and Liver Diseases, The Schneider Children’s Medical Center, Petach Tikva, Israel

¹Roche, Informatics, Basel, Switzerland, ²Department of Clinical Science Gastroimmunology, Genentech, Inc., South San Francisco, USA, ³Immunology, Infectious Disease and Ophthalmology, Roche, Basel, Switzerland

¹Department of Gastroenterology, Peking Union Medical College Hospital, Beijing, China, ²Center for Statistical Science, Tsinghua University, Beijing, China

¹Australian National University Medical School, Australian National University, Canberra, Australia, ²Department of Endocrinology, Canberra Hospital, Canberra, Australia, ³Gastroenterology and Hepatology Unit, Canberra Hospital, Canberra, Australia