1. 2nd Department of Cardiology, General Hospital of Nikea-Piraeus, Nikaia, Greece
2. 2nd Department of Internal Medicine, University of Athens, Attikon Hospital, Athens, Greece
3. Department of Medical Imaging, General Hospital of Nikea-Piraeus, Nikaia, Greece
4. 1st Department of Cardiology, University of Athens, Hippokration Hospital, Athens, Greece