1. Department of Heart Diseases Wroclaw Medical University Borowska 213 Wroclaw 50‐556 Poland
2. Centre for Heart Diseases Wroclaw University Hospital Wroclaw Poland
3. Division of Cardiology Duke University Medical Center Durham NC USA
4. Duke Clinical Research Institute Durham NC USA
5. Department of Medicine Yale University New Haven CT USA
6. Department of Drugs Form Technology, Faculty of Pharmacy Wroclaw Medical University Wroclaw Poland
7. Student scientific organization, Department of Heart Diseases Wroclaw Medical University Wroclaw Poland