1. Centre for Cardiovascular Surgery and Transplantation Brno Czech Republic
2. Department of Cardiac Surgery Palacky University Teaching Hospital Olomouc Czech Republic
3. Department of Microbiology Faculty of Medicine and Dentistry Palacky University and University Hospital Olomouc Czech Republic
4. Hranice Regional Hospital Hranice Czech Republic
5. Faculty of Medicine Institute of Clinical Immunology and Allergology Masaryk University Brno Czech Republic