1. Second Department of Cardiology; Evangelismos General Hospital; Athens Greece
2. Papworth Hospital NHS Foundation Trust; Cambridge UK
3. Department of Cardiology; “G. Gennimatas” General Hospital of Athens; Athens Greece
4. Third Department of Cardiology, Hippokration Hospital, Medical School; Aristotle University of Thessaloniki; Thessaloniki Greece
5. 2nd Department of Cardiology, Medical School, Attikon Hospital; National and Kapodistrian University of Athens; Athens Greece