1 National and Kapodistrian University of Athens, Athens, Greece; Athens Heart Center, Athens Medical Center, Athens, Greece. Electronic address: dtsiachris@yahoo.com.
2 Athens Heart Center, Athens Medical Center, Athens, Greece; Department of Cardiology I, University Hospital Münster, Münster, Germany.
3 National and Kapodistrian University of Athens, Athens, Greece; Athens Heart Center, Athens Medical Center, Athens, Greece.
4 Department of Sport Injuries, Athens Medical Center, Athens, Greece.
5 School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, Greece.
6 Athens Heart Center, Athens Medical Center, Athens, Greece.
7 First Department of Cardiology, National and Kapodistrian University of Athens, Athens, Greece.
8 Department of Cardiology I, University Hospital Münster, Münster, Germany.