1. Department of Pediatrics, Polish-American Children’s Hospital, Jagiellonian University Medical College, Wielicka 265 Street, 30-663 Cracow, Poland
2. Medical Student’s Research Assosciation, Jagiellonian University Medical College, Wielicka 265 Street, 30-663 Cracow, Poland
3. Department of Pediatric Nephrology, Polish-American Children’s Hospital, Jagiellonian University Medical College, Wielicka 265 Street, 30-663 Cracow, Poland