1. Department of Cardiology, Medical University, 20-059 Lublin, Poland
2. 2nd Department of Cardiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, 41-800 Zabrze, Poland
3. Department of Medicine and Health Sciences, The Jan Kochanowski University, 25-369 Kielce, Poland
4. Department of Cardiac Surgery, Świętokrzyskie Center of Cardiology, 25-736 Kielce, Poland
5. Department of Cardiology, The Pope John Paul II Province Hospital, 22-400 Zamość, Poland
6. Department of Cardiac Surgery, The Pope John Paul II Province Hospital, 22-400 Zamość, Poland