title: Definitions of emphysema, chronic bronchitis, asthma, and airflow obstruction: 25 years on from the Ciba symposium.
mesh_terms: D001249:Asthma / Q000145:classification; D001991:Bronchitis / Q000145:classification; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000145:classification; D011656:Pulmonary Emphysema / Q000145:classification; D009626:Terminology as Topic