1 Department of Pediatrics, University Hospital Brno, Medical Faculty of Masaryk University, Brno, Czech Republic.
2 Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague, Czech Republic.
3 Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine, Charles University and General University Hospital in Prague, Prague, Czech Republic. stiburkova@revma.cz.
4 Institute of Rheumatology, Na Slupi 4, 128 50, Prague 2, Czech Republic. stiburkova@revma.cz.