1. Medical School National and Kapodistrian University of Athens Athens Greece
2. Department of Cardiology “G. Gennimatas” General Hospital of Athens Athens Greece
3. Division of Cardiology Hospital Universitario y Politécnico La Fe Valencia Spain
4. Centro de Investigacion Biomédica en Red (CIBERCV) Madrid Spain
5. Medical School Artistotle University of Thessaloniki Thessaloniki Greece