1. Na Homolce Hospital Cardiovascular Centre Prague Czech Republic
2. Centre for Heart Diseases University Hospital Wroclaw Poland
3. Department of Heart Diseases Medical University Wroclaw Poland
4. Department of Vascular, General and Transplant Surgery Medical University Wroclaw Poland
5. Division of Surgical Specialties, Department of Clinical Nursing, Faculty of Health Science Medical University Wroclaw Poland
6. Department of Surgery 4th Military Hospital Wroclaw Poland
7. Duke Clinical Research Institute Durham NC USA
8. Coridea LLC New York NY USA