title: Mucolytic treatment of chronic bronchitis during two winter periods.
mesh_terms: D001964:Bromhexine / Q000627:therapeutic use*; D001991:Bronchitis / Q000188:drug therapy* / Q000503:physiopathology; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004341:Drug Evaluation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010919:Placebos; D012119:Respiration; D012621:Seasons; D011795:Surveys and Questionnaires; D014797:Vital Capacity
chemical_list: D010919:Placebos; D001964:Bromhexine