title: A controlled study of the effect of treatment on chronic bronchitis. An evaluation using pulmonary function tests.
mesh_terms: D000368:Aged; D001991:Bronchitis / Q000188:drug therapy / Q000628:therapy*; D002701:Chloramphenicol / Q000627:therapeutic use; D002908:Chronic Disease; D005100:Expectorants / Q000627:therapeutic use; D006801:Humans; D008875:Middle Aged; D026741:Physical Therapy Modalities; D010919:Placebos; D011189:Potassium Chloride / Q000627:therapeutic use; D012129:Respiratory Function Tests; D013696:Temperature
chemical_list: D005100:Expectorants; D010919:Placebos; D011189:Potassium Chloride; D002701:Chloramphenicol