1. Department of Cardiac Surgery, Medical University of Lublin, 20-059 Lublin, Poland
2. Institute of Medical Sciences, Jan Kochanowski University, 25-317 Kielce, Poland
3. Department of Cardiac Surgery, Świętokrzyskie Center of Cardiology, 25-736 Kielce, Poland
4. 2nd Department of Cardiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, 41-800 Zabrze, Poland
5. Department of Cardiology, Masovian Specialist Hospital of Radom, 26-617 Radom, Poland
6. Department of Cardiology, The Pope John Paul II Province Hospital of Zamość, 22-400 Zamość, Poland
7. Department of Cardiac Surgery, The Pope John Paul II Province Hospital of Zamość, 22-400 Zamość, Poland
8. Department of Cardiology, Medical University of Lublin, 20-059 Lublin, Poland