1. Department of Cardiology The Pope John Paul II Province Hospital of Zamosc Zamosc Poland
2. Collegium Medicum The Jan Kochanowski University Kielce Poland
3. Department of Cardiac Surgery Swietokrzyskie Cardiology Center Kielce Poland
4. 2nd Department of Cardiology Silesian Medical University Zabrze Poland
5. Department of Cardiac Surgery The Pope John Paul II Province Hospital of Zamosc Zamosc Poland
6. Department of Cardiology Medical University Lublin Poland