1. Department of Cardiology and Structural Heart Diseases; Medical University of Silesia; Katowice Poland
2. 3rd Department of Cardiology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice; Silesian Centre for Heart Diseases; Zabrze Poland
3. Department of Cardiology, University Hospital; Faculty of Natural Sciences and Technology; University of Opole Poland
4. Scanmed; Gliwice Poland