title: Slow release theophylline in chronic bronchitis--a comparative study.
mesh_terms: D000368:Aged; D001991:Bronchitis / Q000188:drug therapy*; D002214:Capsules; D002908:Chronic Disease; D003692:Delayed-Action Preparations; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013607:Tablets; D013806:Theophylline / Q000008:administration & dosage* / Q000627:therapeutic use
chemical_list: D002214:Capsules; D003692:Delayed-Action Preparations; D013607:Tablets; D013806:Theophylline