University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, University of Exeter, Wellcome Sanger Institute, University of Exeter - Royal Devon & Exeter Hospital, NHS Foundation Trust - Cambridge University Hospitals, University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, University of Exeter - IBD Pharmacogenetics Group, University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, Queen Mary University of London, University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, St Marks Hospital and Academic Institute, Government of the United Kingdom - Barts Health NHS Trust, Guy’s and St Thomas’ NHS Foundation Trust, Government of the United Kingdom - Royal Wolverhampton NHS Trust, Government of the United Kingdom - Royal Wolverhampton NHS Trust, Northern Care Alliance NHS Group, St Marks Hospital and Academic Institute, Government of the United Kingdom - Hull University Teaching Hospitals NHS Trust, National Institute for Health and Care Research IBD BioResource for Translational Research, Government of the United Kingdom - Department of Gastroenterology, Government of the United Kingdom - Leeds Teaching Hospitals, Guy’s and St. Thomas NHS Foundation Trust - Department of Gastroenterology, Wellcome Sanger Institute, Torbay and South Devon NHS Foundation Trust, Bristol Genetics Laboratory, University of Exeter, University of Exeter, NHS Foundation Trust - Cambridge University Hospitals, University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group and Royal Devon and Exeter NHS Foundation Trust - Department of Gastroenterology

University of Exeter - Exeter Inflammatory Bowel Disease and Pharmacogenetics Research Group, St Mark’s Hospital, UK IBD Registry, Department of Gastroenterology, Royal Devon and Exeter Hospital NHS Foundation Trust, University Hospital Southampton NHS Foundation Trust, UK IBD Registry, UK IBD Registry, University College London Hospitals NHS Foundation Trust, UK IBD Registry, Western General Hospital, NHS Lothian, King's College Hospital - Department of Gastroenterology, Hull and East Yorkshire Hospitals, Government of the United Kingdom - Leeds Teaching Hospitals, Torbay and South Devon NHS Foundation Trust, St Mark’s Hospital, Independent and UK IBD Registry