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