1 National and Kapodistrian University of Athens, Faculty of Medicine, Attikon University Hospital, Athens, Greece.
2 Division of Medicine, Oslo University Hospital, Kirkeveien 166, Building 3-A, N - 0407 Oslo, Norway.
3 University of Heraklion Crete; ESC; European Heart Agency Brussels.
4 Faculty of Medicine, University of Lisbon; Cardiology Department, Heart and Vascular Department, University Hospital, CHLN; University of Lisbon, Portugal; European Society of Cardiology (ESC).