[1]Newborn Department Mulac Hospital Pilsen 301 00 Czech Republic;
[2]Department of Clinical Chemistry and Hematology Mulac Hospital Pilsen 30100 Czech Republic;
[3]Department of Pediatrics Faculty of Medicine Faculty Hospital Charles University Pilsen 301 00 Czech Republic;
[4]Department of Health Accounting and Statistics University Hospital Pilsen 301 00 Czech Republic;