1. Department of Cardiology Medical University of Lublin Lublin Poland
2. 2nd Department of Cardiology, Faculty of Medical Sciences in Zabrze Medical University of Silesia Katowice Poland
3. Department of Radiography Medical University of Lublin Lublin Poland
4. Department of Cardiology The Pope John Paul II Province Hospital Zamość Poland
5. Department of Cardiology Masovian Specialistic Hospital of Radom Radom Poland
6. Department of Cardiac Surgery of Medical University Medical University of Lublin Lublin Poland
7. Department of Cardiac Surgery The Pope John Paul II Province Hospital Zamość Poland