1. Department of Electrocardiology and Heart Failure, Medical University of Silesia in Katowice, 40-635 Katowice, Poland
2. Department of Electrocardiology, Upper-Silesian Medical Centre, 40-635 Katowice, Poland
3. Department of Rehabilitation, Medical University of Silesia in Katowice, 40-635 Katowice, Poland
4. Day Treatment Cardiac Rehabilitation Ward, Upper-Silesian Medical Centre, 40-635 Katowice, Poland