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