1. Department of Internal Medicine and Cardiology, Herzzentrum Dresden, Technische Universität Dresden, 01307 Dresden, Germany
2. Department of Cardiology, Heart Center Leipzig, University Hospital, 04289 Leipzig, Germany
3. Department of Cardiac Surgery, Heart Center Leipzig, University Hospital, 04289 Leipzig, Germany
4. 1st Department of Cardiology, Medical University of Warsaw, 02-091 Warsaw, Poland
5. Department of Interventional Cardiology and Angiology, National Institute of Cardiology, 04-628 Warsaw, Poland
6. Department of Cardiac Surgery and Transplantology, Poznan University of Medical Sciences, 61-701 Poznan, Poland
7. 1st Department of Cardiology, Poznan University of Medical Sciences, 61-701 Poznan, Poland
8. Institute of Heart Diseases, Wroclaw Medical University, ul. Borowska 213, 50-556 Wroclaw, Poland
9. Department of Cardiac Surgery, Medical University of Silesia, 40-055 Katowice, Poland
10. Department of Cardiac Surgery, Herzzentrum Dresden, Technische Universität Dresden, 01307 Dresden, Germany
11. Department of Cardiac Surgery, Helios University Hospital Wuppertal, 42117 Wuppertal, Germany
12. Department of Cardiology and Structural Heart Diseases, Medical University of Silesia, 40-055 Katowice, Poland