1. Department of Cardiology; Paracelsus Medical Private University (PMU); Salzburg Landeskliniken, Muellner Hauptstrasse 48 Salzburg 5020 Austria
2. Second Cardiology Department and Heart Failure Unit; University of Athens Medical School, Attikon University Hospital; Athens Greece
3. Department of Medical Statistics, Informatics and Health Economics; Innsbruck Medical University; Innsbruck Austria
4. Department of Cardiology; Innsbruck Medical University; Innsbruck Austria