1 Cardiovascular Prevention and Research Unit, Clinic/Laboratory of Pathophysiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
2 Department of Cardiology, "G.Gennimatas" General Hospital of Athens, Athens, Greece.
3 First Department of Cardiology, Biomedical Engineering Unit, Medical School, National and Kapodistrian University of Athens, Athens, Greece.