1 2nd Department of Nephrology and Hypertension with Dialysis Unit, Medical University of Białystok, Białystok, Poland. Electronic address: alicja.rosolowska@umb.edu.pl.
2 2nd Department of Nephrology and Hypertension with Dialysis Unit, Medical University of Białystok, Białystok, Poland.
3 2nd Clinical Department of General and Gastroenterological Surgery, Medical University of Białystok, Białystok, Poland.