1. Department of Cardiology, Hippokration General Hospital, 114 Vasilisis Sofias str, Athens, Greece
2. Department of Cardiology, Laikon General Hospital, Ag Thoma sq, Athens, Greece
3. Department of Cardiology, First Cardiology Division, University of Athens, Medical School, Hippokration General Hospital, 114 Vasilisis Sofias str, Athens, Greece