1. 2nd Department of Cardiology University Hospital of Ioannina Ioannina Greece
2. Department of Cardiology Patras University Hospital Patras Greece
3. 1st Department of Cardiology “Hippokration” University Hospital Athens Greece
4. Cardiology Department General Hospital “G. Gennimatas” Athens Greece
5. 2nd Department of Cardiology “Papageorgiou” General Hospital Thessaloniki Greece
6. 1st Department of Cardiology “Evaggelismos” General Hospital Athens Greece
7. 2nd Department of Cardiology “Evaggelismos” General Hospital Athens Greece
8. 2nd Department of Cardiology Hellenic Red Cross Hospital Athens Greece
9. Department of Cardiology “Attikon” University Hospital Athens Greece
10. Department of Cardiology University Hospital of Larissa Larissa Greece
11. Department of Cardiology “Sismanogleio” General Hospital Athens Greece
12. Department of Cardiology “AHEPA” University Hospital Thessaloniki Greece
13. Department of Cardiology University Hospital of Alexandroupolis Thrace Greece
14. Department of Cardiology General Hospital “G. Hatzikosta” Ioannina Greece
15. Department of Cardiology “Thriasion” General Hospital of Elefsina Attiki Greece
16. Department of Cardiology “Konstandopoulio” General Hospital Athens Greece
17. Department of Cardiology “Elpis” General Hospital Athens Greece
18. 2nd Department of Cardiology General Hospital of Nikea‐Piraeus “Agios Panteleimon” Piraeus Greece
19. Department of Cardiology 401 Army General Hospital Athens Greece
20. Department of Cardiology Athens Naval Hospital Athens Greece
21. Department of Cardiology New York Presbyterian Hospital/Columbia University Irving Medical Center New York New York USA