1. Department of Cardiac Surgery The Pope John Paul II Province Hospital of Zamość Zamość Poland
2. Department of Cardiac Surgery Medical University of Lublin Lublin Poland
3. Department of Physiology, Pathophysiology and Clinical Immunology Collegium Medicum of Jan Kochanowski University Kielce Poland
4. Department of Cardiac Surgery Świętokrzyskie Centrum of Cardiology Kielce Poland
5. 2nd Department of Cardiology, Zabrze, Faculty of Medical Science in Zabrze Medical University of Silesia Katowice Poland
6. Department of Cardiac Surgery Masovian Specialistic Hospital Radom Poland
7. Department of Cardiology The Pope John Paul II Province Hospital of Zamość Zamość Poland
8. Department of Cardiology Medical University of Lublin Lublin Poland