1. Department of Cardiac Surgery, Upper Silesia Medical Center, Medical University of Silesia, 47 Ziołowa Street, 40-635 Katowice, Poland
2. Department of Anesthesiology and Intensive Care, Upper Silesia Medical Center, 40-635 Katowice, Poland
3. 1st Department of Cardiology, Upper Silesia Medical Center, Medical University of Silesia, 40-635 Katowice, Poland
4. Department of Psychiatry and Psychotherapy, Upper Silesia Medical Center, Medical University of Silesia, 40-635 Katowice, Poland
5. Department of Biostatistics, Chair of Public Health, Medical University of Silesia, 41-902 Bytom, Poland