1. First Cardiologic Department (Clinic), Medical School, University of Athens, Hippokration Hospital, 114 Vasilissis Sofias Avenue, 11527 Athens, Greece
2. Second Neurologic Department (Clinic), Medical School, University of Athens, Attikon Hospital, Athens, Greece
3. Department of Cardiology, Helena Venizelou Hospital, Athens, Greece
4. Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy