title: In vitro method of comparing clouds produced from inhalation aerosols for efficiency in penetration of airways.
mesh_terms: D000336:Aerosols; D001993:Bronchodilator Agents; D005069:Evaluation Studies as Topic; D006801:Humans; D012138:Respiratory Therapy / Q000295:instrumentation; D013997:Time Factors
chemical_list: D000336:Aerosols; D001993:Bronchodilator Agents