title: Combined bronchodilator therapy for severe airways obstruction.
mesh_terms: D000402:Airway Obstruction / Q000188:drug therapy* / Q000503:physiopathology; D001993:Bronchodilator Agents / Q000008:administration & dosage*; D004359:Drug Therapy, Combination; D006801:Humans; D008722:Methods; D012129:Respiratory Function Tests
chemical_list: D001993:Bronchodilator Agents