1. Second Cardiology Department Attikon Hospital National and Kapodistrian University of Athens Athens Greece
2. Minneapolis Heart Institute and Minneapolis Heart Institute Foundation Abbott Northwestern Hospital Minneapolis MN USA
3. First Department of Cardiology Hippokrateion Hospital National and Kapodistrian University of Athens Athens Greece
4. State Department of Cardiology Hippokrateion Hospital Athens Greece
5. Second State Cardiology Department Evangelismos Hospital Athens Greece
6. Electrophysiology Department Hospital Haut Lévêque Bordeaux France