1. Cardiac Rehabilitation Center Grossgmain, Pensionsversicherungsanstalt and Department of Cardiology; Paracelsus Medical Private University (PMU); Salzburg Austria
2. Second Cardiology Department and Heart Failure Unit; University of Athens Medical School, Attikon University Hospital; Athens Greece
3. Department of Cardiology; University Heart Centre Hamburg; Hamburg Germany
4. Department of Cardiology; Hospital of the Sisters of Charity Linz; Linz Austria
5. Department of Cardiology; St. Elisabeth Hospital Linz; Linz Austria
6. Cardiology Department; G. Gennimatas General Hospital; Athens Greece
7. Department of Cardiology; General Hospital Linz; Linz Austria
8. Department of Cardiology; Ippokration General Hospital; Athens Greece
9. Department of Cardiology; Klinikum Wels-Grieskirchen; Wels-Grieskirchen Austria
10. Department of Cardiology; Danube Hospital; Vienna Austria
11. Department of Medical Statistics, Informatics and Health Economics; Innsbruck Medical University; Innsbruck Austria
12. Department of Cardiology and Angiology; Innsbruck Medical University; Innsbruck Austria