1. First Department of Cardiology; Medical University of Warsaw; Warsaw Poland
2. Institute of Cardiology; Warsaw-Anin Poland
3. Third Department of Cardiology; Medical University of Silesia; Katowice Poland
4. First Department of Cardiology; Medical University of Poznan; Poznan Poland
5. Department of Cardiac and Vascular Surgery; Medical University of Gdańsk; Gdańsk Poland
6. Department of Cardiology; Medical University of Gdańsk; Gdańsk Poland
7. Department of Cardiac Surgery; Medical University of Warsaw; Poland
8. Department of Cardiac Surgery; Silesian Center for Heart Diseases; Zabrze Poland