1 Department of Nephrology, Transplantology and Internal Medicine, Faculty of Medicine, Medical University of Gdansk, Gdańsk, Poland
2 Department of Occupational, Metabolic and Internal Diseases, Faculty of Health Science, Medical University of Gdansk, Gdynia, Poland
3 Department of Medical Immunology, Faculty of Medicine, Medical University of Gdansk, Gdańsk, Poland
4 Central Clinical Laboratory, University Clinical Center, Gdańsk, Poland
5 Department of Nephrology, Transplantology and Internal Medicine, Faculty of Medicine, Medical University of Gdansk, Gdańsk, Poland. adeb@gumed.edu.pl