1. Institute of Clinical Physiology of the National Research Council, CNR , Via Moruzzi 1, 56124 Pisa , Italy
2. University of Liège , Walloon Region , Belgium
3. CHUAC-Complexo Hospitalario Universitario A Coruna, CIBER-CV, University of A Coruna , 15070 La Coruna , Spain
4. Cardiology Clinic, University Clinical Centre of Serbia, Medical School, University of Belgrade , 11000 Belgrade , Serbia
5. University of Pittsburgh Medical Center UPMC Heart & Vascular Institute , Pittsburgh, PA , USA
6. Cardiology Department, San Luca Hospital , 55100 Lucca , Italy
7. Department of Cardiology, Antwerp University Hospital , 2650 Edegem , Belgium
8. Centre of Cardiology and Angiology, Clinic of Cardiac and Vascular Diseases, Faculty of Medicine, Institute of Clinical Medicine, Vilnius University , LT-03101 Vilnius , Lithuania
9. Cardiology Department, Parma University Hospital , 43100 Parma , Italy
10. Cardiology Division, Fatebenefratelli Hospital , 82100 Benevento , Italy
11. Imperial College , UK
12. Royal Brompton Hospital Imperial College London , UK
13. Northwick Park Hospital , London , UK
14. Department of Cardiology, University Clinical Hospital Center Zemun-Belgrade Faculty of Medicine, University of Belgrade , Serbia
15. Department of Public Health and Clinical Medicine Units: Section of Medicine, Umea University , Umea , Sweden