[Epidemiological problems of viral hepatitis in children during the 1st year of life].
D000367:Age Factors; D005260:Female; D006506:Hepatitis A / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D065227:Transfusion Reaction
Zagadnienia epidemiologiczne wirusowego zapalenia watroby y dzieci w pierwszym roku zycia.