1 | Department of Electrocardiology, Medical University of Lodz, Lodz, Poland |
2 | Department of Cardiology and Electrotherapy, Medical University of Gdansk, Gdansk, Poland |
3 | 1st Chair and Department of Cardiology, Medical University of Warsaw, Warsaw, Poland |
4 | 3rd Chair and Department of Cardiology, Silesian Medical University, Katowice, Poland |
5 | Department of Cardiology, Congenital Heart Diseases and Electrotherapy, SIlesian Medical University, Katowice, Poland |
6 | Department of Cardiosurgery, Medical University of Lodz, Lodz, Poland |