1. Department of Clinical Laboratory Diagnostics, Medical University of Bialystok, J. Waszyngton 15a, 15-269 Bialystok, Poland
2. Second Department of General and Gastroenterological Surgery, Medical University of Bialystok, M. Sklodowska-Curie 24a, 15-264 Bialystok, Poland
3. Department of Haematological Diagnostics, Medical University of Bialystok, J. Waszyngton 15a, 15-269 Bialystok, Poland