1. Dialysis Division for Children, Department of Pediatric Nephrology, Public Clinical Hospital, Zabrze, Poland
2. Chair and Clinical Department of Pediatrics, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia in Katowice, Zabrze, Poland
3. Chair and Department of Medical and Molecular Biology, SMDZ in Zabrze, SUM in Katowice, Zabrze, Poland
4. Cardiological Outpatient “Medicor”, Myszków, Poland