1. Witelon Collegium State University, 59-220 Legnica, Poland
2. Department of Cardiology, Provincial Specialized Hospital in Legnica, 59-220 Legnica, Poland
3. Department of Cardiology, The Copper Health Centre (MCZ), 59-300 Lubin, Poland
4. Adalbert’s Hospital, 61-144 Poznan, Poland
5. Faculty of Mathematics and Information Science, Warsaw University of Technology, 00-662 Warsaw, Poland
6. Faculty of Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland
7. Clinical Department of Internal and Occupational Diseases, Hypertension and Clinical Oncology, Wroclaw Medical University, 50-556 Wroclaw, Poland
8. 1st Department of Cardiology, Poznan University of Medical Sciences, 61-491 Poznan, Poland