1. 1st Department of Cardiology; Medical University of Warsaw; Warsaw Poland
2. Department of Cardiology, Congenital Heart Diseases and Electrotherapy; Silesian Center for Heart Disease; Zabrze Poland
3. Department of Cardiac Surgery; Medical University of Gdansk; Gdansk Poland
4. Polish-American Heart Clinic; Bielsko-Biala Poland
5. Department of Cardiology, Centre for Heart Diseases; Military Hospital; Wroclaw Poland
6. Department of Cardiac Surgery; District Hospital 2; Rzeszow Poland
7. Department of Interventional Cardiology and Angiology; Institute of Cardiology; Warsaw Poland
8. Department of Cardiac Surgery; Medical University of Bialystok; Bialystok Poland
9. Department of Cardiology; Poznan University of Medical Sciences; Poznan Poland
10. Department of Intensive Cardiac Care; Medical University of Lodz; Lodz Poland
11. Department of Cardiac Surgery; Medical University of Warsaw; Warsaw Poland
12. 3rd Department of Cardiology; Medical University of Silesia; Katowice Poland
13. Department of Cardiac Surgery and Transplantology; Silesian Center for Heart Disease; Zabrze Poland
14. Division of Cardiology; University of Washington Medical Center; Seattle Washington