Author information:
(1)(1) Department of Paediatrics, Klatovy Hospital, Klatovy, Czech Republic.
(2)(2) Department of Paediatrics, Pardubice Hospital, Pardubice, Czech Republic.
(3)(3) Department of Paediatrics, Faculty of Medicine and Faculty Hospital in 
Hradec Kralove, Charles University, Hradec Kralove, Czech Republic.