[Resolved and unresolved problems of age grouping in childhood].
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002965:Classification; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010372:Pediatrics
Reshennye i nereshennye voprosy periodizatsii detskogo vozrasta.