1. Department of Clinical Anatomy, Medical University of Gdańsk, Gdańsk - Poland
2. Department of Nephrology and Dialysis, Regional Specialist Hospital, Grudziądz - Poland
3. Department of Nephrology, Hypertension and Internal Medicine, The Ludwig Rydygier Collegium Medicum, Nicolaus Copernicus University, Dr. Antoni Jurasz University Hospital, Bydgoszcz - Poland