[During the 1920's].
D000293:Adolescent; D002648:Child; D005858:Germany; D049673:History, 20th Century; D006801:Humans; D007223:Infant; D007226:Infant Mortality / Q000266:history; D007231:Infant, Newborn; D012572:School Health Services / Q000266:history
Aud den 20er Jahren.