1. 3rd Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Sotiria Chest Disease Hospital, 11527 Athens, Greece
2. 1st Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Hippokration General Hospital, 11527 Athens, Greece
3. Cardiovascular Division, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA