1. 1st Cardiology Department, Hippokration Hospital, Athens Medical School, Athens, Greece
2. Henry Dunant Hospital, Athens, Greece
3. Athens Medical School, Attikon University Hospital, Athens, Greece
4. Second Department of Cardiology, Athens Euroclinic, Greece
5. General Hospital of Chalkida, Chalkida, Greece
6. Skylitsion General Hospital of Chios, Chios, Greece
7. First Department of Cardiology, AHEPA University Hospital, Aristotle University Medical School, Thessaloniki, Greece
8. Cardiology Department, Democritus University of Thrace, Alexandroupolis, Greece
9. Department of Cardiology, Konstantopoulio General Hospital, Athens, Greece
10. Bodosakeio General Hospital of Ptolemaida, Ptolemaida, Greece
11. Cardiology Department, General Hospital of Kavala, Kavala, Greece
12. Department of Cardiology, 2nd IKA Hospital, Thessaloniki, Greece
13. Department of Cardiology, Sotiria Chest Diseases Hospital, Athens, Greece
14. AstraZeneca SA, Medical Department, Athens, Greece
15. Department of Cardiology, Heraklion University Hospital, Crete, Greece