title: Physiologic variants of chronic obstructive lung disease.
mesh_terms: D000368:Aged; D001991:Bronchitis / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000503:physiopathology*; D012129:Respiratory Function Tests