title: [Serum vitamin A in respiratory diseases--with special reference to chronic bronchitis and bronchiectasis].
mesh_terms: D000293:Adolescent; D000328:Adult; D001987:Bronchiectasis / Q000097:blood*; D001991:Bronchitis / Q000097:blood*; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000097:blood; D008297:Male; D008875:Middle Aged; D014801:Vitamin A / Q000097:blood*
chemical_list: D014801:Vitamin A