1. Department of Cardiology and Imaging, Royal Brompton and Harefield NHS Foundation Trust, London UB9 6JH, UK
2. Imperial College London, National Heart and Lung Institute, London SW7 2AZ, UK
3. Imperial College NHS Healthcare Trust, London W2 1NY, UK
4. Department of Cardiology, East and North Hertfordshire NHS Trust, Stevenage SG1 4AB, UK
5. Department of Cardiology, Buckinghamshire Healthcare NHS Trust, Amersham HP7 0JD, UK
6. Department of Cardiology, The Hillingdon Hospitals NHS Foundation Trust, Uxbridge UB8 3NN, UK
7. Department of Cardiology, London North West Healthcare NHS Trust, Harrow HA1 3UJ, UK
8. Department of Cardiology, Luton and Dunstable University Hospital, Luton LU4 0DZ, UK
9. Department of Cardiology, John Radcliffe Hospital, Oxford, OX3 9DU, UK
10. Joint Department of Medical Imaging, University Hospital Network, Toronto, Canada
11. NIHR Cardiovascular Biomedical Research Unit, Bart’s Heart Centre, London EC1A 7BE, UK