title: Epidemiological and clinical investigation of the acute non-tuberculous pneumonias.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003604:Czechoslovakia; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000175:diagnosis / Q000453:epidemiology*; D012621:Seasons