title: A double-blind comparison of slow-release tetracycline and tetracycline hydrochloride in purulent exacerbations of chronic bronchitis.
mesh_terms: D001991:Bronchitis / Q000188:drug therapy*; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D003692:Delayed-Action Preparations; D006801:Humans; D013492:Suppuration / Q000188:drug therapy; D013752:Tetracycline / Q000008:administration & dosage* / Q000627:therapeutic use
chemical_list: D003692:Delayed-Action Preparations; D013752:Tetracycline