[Evaluation of morbidity in the youngest children in short-term registration].
D004812:Epidemiologic Methods; D006306:Health Surveys; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000453:epidemiology; D009017:Morbidity; D011044:Poland
Ocena zachorowalności dzieci najmłodszych z rejestracji krótkotrwałej.