1 Division of Clinical Electrophysiology, Department of Internal Medicine and Cardiology, Medical University of Warsaw, Poland, Warsaw, Poland. piotrgardziejczyk@gmail.com.
2 Arrhythmia Center, National Institute of Cardiology, Warsaw, Poland.
3 Department of Cardiology, Medical University of Lublin, Lublin, Poland.
4 Division of Clinical Electrophysiology, Department of Internal Medicine and Cardiology, Medical University of Warsaw, Poland, Warsaw, Poland.