1. Student’s Scientific Society, 3rd Department of Cardiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland
2. Silesian Center for Heart Diseases, 41-800 Zabrze, Poland
3. Department of Biostatistics, Faculty of Public Health in Bytom, Medical University of Silesia, 40-055 Katowice, Poland
4. Department of Descriptive and Topographic Anatomy, Faculty of Medical Sciences, Medical University of Silesia, 40-055 Katowice, Poland
5. Department of Biochemistry, Faculty of Medical Sciences, Medical University of Silesia, 40-055 Katowice, Poland
6. 3rd Department of Cardiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland