1. Faculty of Health Sciences and Physical Culture, Witelon Collegium State University, 59-220 Legnica, Poland
2. Department of Cardiology, Provincial Specialized Hospital, 59-220 Legnica, Poland
3. Department of Cardiology, The Copper Health Centre (MCZ), 59-300 Lubin, Poland
4. Faculty of Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland
5. Department of Cardiology, Center for Heart Diseases, 4th Military Hospital, Faculty of Medicine, Wroclaw University of Science and Technology, 50-981 Wroclaw, Poland
6. 1st Department of Cardiology, University of Medical Sciences, 61-848 Poznan, Poland