1. Royal Brompton & Harefield Hospitals , UB9 6JH, UK
2. Chelsea and Westminster Hospital , SW10 9NH, UK
3. National Heart and Lung Institute , Guy Scadding Building, Cale Street, London , SW3 6LY, UK
4. Brigham and Women's Hospital , 15 Francis Street, Boston, MA 02115 , USA
5. East Surrey Hospital , Surrey and Sussex NHS Trusts, UK
6. King's College Hospital , British Heart Foundation Centre of Research Excellence, UK
7. Broomfield Hospital , Chelmsford , UK
8. Stoke Mandeville Hospital , Mandeville Rd, Aylesbury HP21 8AL, UK
9. Lahey Hospital and Medical Center , 41 Burlington Mall Rd, Burlington, MA , USA
10. Imperial College London and Imperial College Healthcare NHS Trust, Imperial Vascular Unit, Mary Stanford Wing, St Mary's Hospital , Praed Street, London W2 1NY, UK
11. National Heart and Lung Institute , Imperial College London, London , UK