1 Students' Scientific Society affiliated at National Institute of Cardiology, Warsaw, Poland.
2 First Department of Arrhythmia, National Institute of Cardiology, Warsaw, Poland; First Department of Cardiology, Medical University of Warsaw, Warsaw, Poland.
3 Department of Radiology, National Institute of Cardiology, Warsaw, Poland.
4 First Department of Cardiology, Medical University of Warsaw, Warsaw, Poland.
5 First Department of Arrhythmia, National Institute of Cardiology, Warsaw, Poland.