1. Department of Cardiac Surgery, Faculty of Medicine and University Hospital in Hradec Kralove, Charles University , Hradec Kralove, Czech Republic
2. Department of Cardiac Surgery, Faculty of Medicine and East Slovak Institute of Cardiovascular Disease, Pavol Jozef Šafárik University , Košice, Slovakia
3. Department of Cardiac Surgery, Hospital AGEL Trinec-V Podlesí , Trinec, Czech Republic
4. Department of Cardiac Surgery, Na Homolce Hospital , Prague, Czech Republic
5. Department of Cardiovascular Surgery, University Hospital in Motol , Prague, Czech Republic
6. 2nd Department of Surgery, 1st Faculty of Medicine and General University Hospital in Prague, Charles University , Prague, Czech Republic
7. Department of Cardiovascular Surgery and Transplantation, Faculty of Medicine, Masaryk University , Brno, Czech Republic
8. Department of Cardiovascular Surgery, University Hospital Frankfurt and Goethe University Frankfurt , Frankfurt/Main, Germany