University of Exeter, Government of the United Kingdom - Royal Devon and Exeter Hospital, University of Exeter - Medical School, Government of the United Kingdom - Royal Devon and Exeter Hospital, University of Exeter, University of Exeter, University of Exeter, Government of the United Kingdom - Royal Devon and Exeter Hospital, Government of the United Kingdom - Royal Devon and Exeter Hospital, NHS Foundation Trust - London North West Healthcare NHS Trust, University of Exeter - IBD Pharmacogenetics Research Group, Government of the United Kingdom - Royal Devon and Exeter Hospital, Government of the United Kingdom - Royal Devon and Exeter Hospital, University of Exeter - IBD Pharmacogenetics Research Group, Government of the United Kingdom - NHS Greater Glasgow and Clyde, University of Southampton, Western General Hospital Edinburgh, NHS Foundation Trust - London North West Healthcare NHS Trust, NHS Foundation Trust - Cambridge University Hospitals, Hull and East Yorkshire Hospitals, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Guy's and St Thomas' NHS Foundation Trust, Government of the United Kingdom - Barts Health NHS Trust, Government of the United Kingdom - NHS Greater Glasgow and Clyde, Government of the United Kingdom - Royal Devon and Exeter Hospital, Cedars Sinai Medical Center, Independent, University of Exeter and University of Exeter - IBD Pharmacogenetics Research Group