1. Oxford Heart Centre; Oxford University Hospitals Trust, John Radcliffe Hospital, Headley Way, Headington; Oxford UK
2. Department of Cardiology; Walsall Healthcare NHS Trust; Walsall UK
3. Institute of Health Informatics Research; University College London; London UK
4. National Institute for Health Research (NIHR) Health Protection Research Unit (HPRU) in Healthcare Associated Infections and Antimicrobial Resistance; Imperial College London; London UK
5. Department of Cardiology; Addenbrookes Hospital (Cambridge University Hospitals); Cambridge UK
6. University of East Anglia; Norwich UK
7. Department of Cardiology; Royal Free Hospital, Royal Free London NHS Foundation Trust; London UK
8. Department of Anaesthesia; St Helier Hospital; London UK
9. Department of Cardiology; Royal Free Hospital; London UK
10. Department of Cardiology; Calderdale Royal Hospital; Halifax UK
11. Department of Acute Medicine; Scunthrope General Hospital; Scunthorpe UK
12. Centre for Cardiology in the Young; The Heart Hospital, University College London Hospitals; London UK
13. Royal Free Hospital; London UK
14. MRC Unit of Lifelong Health and Ageing; University College London; London UK
15. Barts Heart Centre; St Bartholomew's Hospital, Barts Health NHS Trust; London UK