1 First Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Greece. Electronic address: thepap@med.uoa.gr.
2 First Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Greece; Third Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Greece.
3 First Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Greece.