title: Experiences with antibiotic trials in chronic bronchitis.
mesh_terms: D000667:Ampicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001991:Bronchitis / Q000188:drug therapy*; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D006801:Humans; D008690:Methacycline / Q000627:therapeutic use; D013147:Spirometry; D013183:Sputum / Q000382:microbiology; D013752:Tetracycline / Q000627:therapeutic use
chemical_list: D000900:Anti-Bacterial Agents; D000667:Ampicillin; D013752:Tetracycline; D008690:Methacycline