title: Mucolytic treatment of chronic bronchitis during two winter periods.
mesh_terms: D001314:Auscultation; D001555:Benzene Derivatives / Q000627:therapeutic use*; D001593:Benzyl Compounds; D001794:Blood Pressure; D001991:Bronchitis / Q000188:drug therapy*; D002452:Cell Count; D002908:Chronic Disease; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D010919:Placebos; D011652:Pulmonary Circulation; D012129:Respiratory Function Tests; D012621:Seasons; D012737:Sex Factors; D012907:Smoking; D012924:Social Conditions; D013147:Spirometry; D013997:Time Factors
chemical_list: D001555:Benzene Derivatives; D001593:Benzyl Compounds; D010919:Placebos