1. First Department of Cardiology, Medical School, National and Kapodistrian University of Athens, “Hippokration” General Hospital of Athens, Athens, Greece;
2. Department of Cardiology, Faculty of Medicine, University of Patras, University Hospital of Patras, Patras, Greece;
3. Department of Radiology, Brigham and Women's Hospital, Boston, MA; and
4. Second Department of Cardiology, Medical School, National and Kapodistrian University of Athens, “Attikon” University Hospital of Patras, Athens, Greece.