1. 1Doncaster and Bassetlaw Teaching Hospitals NHS Foundation Trust, Cardio-Respiratory, Doncaster Royal Infirmary, Doncaster, UK
2. 2Grantham and District Hospital, Cardiology, Grantham, Lincolnshire, UK
3. 3Department of Anaesthesia, Frimley Park Hospital, Frimley, Surrey, UK
4. 4Shrewsbury and Telford Hospital NHS Trust, Cardiology, Shrewsbury, UK
5. 5York Teaching Hospital NHS Foundation Trust, CardioRespiratory, York, UK
6. 6University Hospital Birmingham and University of Birmingham, Cardiology, Birmingham, West Midlands, UK
7. 7United Lincolnshire NHS Trust, Cardiology, Grantham, UK
8. 8Royal Berkshire NHS Foundation Trust, Cardiology, Reading, UK
9. 9Imperial College Healthcare NHS, Echocardiography Department, St Mary’s Hospital, Paddington, London, UK
10. 10Dudley Group of Hospitals NHS Trust, Cardiology, Dudley, West Midlands, UK
11. 11University Hospital South Manchester, Cardiology, Wythenshawe, Manchester, UK
12. 12Sandwell and West Birmingham Hospitals NHS Trust, Cardiology, Birmingham, UK
13. 13Liverpool Heart and Chest Hospital NHS Foundation Trust, Cardiology, Liverpool, UK