1. 2nd Department of Nephrology and Hypertension with Dialysis Unit, Medical University in Bialystok, Bialystok, Poland
2. Department of Nephrology, Dialysis and Internal Medicine, Warsaw Medical University, Warsaw, Poland
3. Department of Oncological Surgery, Regional Cancer Center, Bialystok, Poland
4. 1st Department of Nephrology and Transplantology with Dialysis Unit, Medical University in Bialystok, Bialystok, Poland