1. 1st Department of Cardiology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, AHEPA Hospital, St. Kiriakidi 1, 546 36 Thessaloniki, Greece
2. Cardiology Department, Sismanoglio Hospital, 151 26 Athens, Greece
3. 424 General Military Hospital, 564 29 Thessaloniki, Greece
4. Department of Nephrology, School of Medicine, Aristotle University of Thessaloniki, Hippokration Hospital, 546 42 Thessaloniki, Greece
5. Department of Cardiology, Hospital University Germans Triasi Pujol, 08916 Barcelona, Spain