1. Cardiology Department, Nicosia General Hospital, Nicosia 2029, Cyprus
2. First Department of Cardiology, AHEPA University Hospital, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
3. Third Department of Cardiology, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
4. Second Department of Cardiology, Aristotle University of Thessaloniki, 54642 Thessaloniki, Greece