1. The Nicolaus Copernicus Municipal Polyclinical Hospital in Olsztyn, 10-045 Olsztyn, Poland
2. Marie Sklodowska-Curie Specialist Hospital in Zgierz, 95-100 Zgierz, Poland
3. Students’ Scientific Group, Department of Cardiology, Medical University of Bialystok, 15-089 Białystok, Poland
4. Department of Family Medicine and Infectious Diseases, Medical Faculty, Collegium Medicum, University of Warmia and Mazury, 10-719 Olsztyn, Poland