1. Royal Brompton Hospital (Guy's and St Thomas' NHS Foundation Trust) Sydney Street London SW3 6NP UK
2. University Hospital Southampton Southampton UK
3. Great Western Hospital Swindon UK
4. Glenfield Hospital Leicester UK
5. Royal Bournemouth Hospital Bournemouth UK
6. Golden Jubilee National Hospital Clydebank UK
7. Queen Alexandra Hospital Cosham UK
8. Oxford Biomedical Research Centre Oxford University Hospitals NHS Foundation Trust Oxford UK
9. St Thomas' Hospital London UK
10. Manchester Heart Centre Manchester Royal Infirmary Manchester UK
11. Queen Elizabeth Hospital Birmingham UK
12. St Bartholomew's Hospital London UK
13. University Hospital of North Staffordshire Stoke‐on‐Trent UK
14. Northern General Hospital Sheffield UK
15. Royal Papworth Hospital NHS Foundation Trust Cambridge UK
16. Abbott Chicago IL USA