The rise of children's hospitals and their activities in Poland in the years 1957-1964-65.
D000293:Adolescent; D002648:Child; D002673:Child, Hospitalized; D002675:Child, Preschool; D005260:Female; D006276:Health Facility Size; D006782:Hospitals, Special; D006801:Humans; D007223:Infant; D008297:Male; D011044:Poland