1. Department of Cardiology, Medical University of Lublin, 20-059 Lublin, Poland
2. 2nd Department of Cardiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland
3. Department of Cardiology, The Pope John Paul II Province Hospital of Zamosc, 22-400 Zamosc, Poland
4. Department of Medicine and Health Sciences, The John Kochanowski University, 25-369 Kielce, Poland
5. Department of Cardiac Surgery, Świętokrzyskie Center of Cardiology, 25-736 Kielce, Poland
6. Department of Cardiology, Masovian Specialistic Hospital of Radom, 26-617 Radom, Poland
7. Department of Cardiac Surgery, The Pope John Paul II Province Hospital of Zamosc, 22-400 Zamosc, Poland