1. Students' Scientific Association, Laboratory for Applied Research on Cardiovascular System, Department of Heart Diseases; Wroclaw Medical University; Wroclaw Poland
2. Laboratory for Applied Research on Cardiovascular System, Department of Heart Diseases; Wroclaw Medical University; Wroclaw Poland
3. Cardiology Department, Centre for Heart Diseases; Military Hospital; Wroclaw Poland
4. Department of Heart Diseases; Wroclaw Medical University; Wroclaw Poland