1. Department of Principles of Clinical Medicine, Nicolaus Copernicus University, Collegium Medicum, Bydgoszcz, Poland;
2. Department of Laboratory Medicine, Nicolaus Copernicus University, Collegium Medicum, Bydgoszcz, Poland;
3. Department of Cardiology and Internal Medicine, Nicolaus Copernicus University, Collegium Medicum, Bydgoszcz, Poland