[Chronic bronchitis].
D001991:Bronchitis / Q000188:drug therapy / Q000628:therapy*; D001993:Bronchodilator Agents / Q000627:therapeutic use; D006801:Humans; D008297:Male; D008875:Middle Aged; D010447:Peptide Hydrolases / Q000627:therapeutic use
D001993:Bronchodilator Agents; D010447:Peptide Hydrolases