1 1st Department of Cardiology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Upper Silesia Medical Center, Katowice, Poland
2 Department of Cardiology, School of Health Sciences in Katowice, Medical University of Silesia, Katowice, Poland; Upper Silesia Medical Center, Katowice, Poland
3 3rd Department of Cardiology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Upper Silesia Medical Center, Katowice, Poland
4 Department of Electrocardiology and Heart Failure, School of Health Sciences in Katowice, Medical University of Silesia, Katowice, Poland; Upper Silesia Medical Center, Katowice, Poland
5 Department of Daily Cardiology Rehabilitation, Upper Silesia Medical Center, Katowice, Poland; Upper Silesia Medical Center, Katowice, Poland
6 1st Department of Cardiology, School of Medicine in Katowice, Medical University of Silesia, Katowice, Poland; Upper Silesia Medical Center, Katowice, Poland. welwetek@poczta.onet.pl