1. Department of Gastroenterology and Hepatology; School of Medicine in Katowice; Medical University of Silesia; Katowice Poland
2. Department of Epidemiology; School of Medicine in Katowice; Medical University of Silesia; Katowice Poland
3. Department of Pathophysiology; School of Medicine in Katowice; Medical University of Silesia; Katowice Poland
4. Department of Nephrology, Transplantology and Internal Diseases; School of Medicine in Katowice; Medical University of Silesia; Katowice Poland