Chronic bronchitis as an etiologic factor in obstructive emphysema; preliminary report.
D001991:Bronchitis; D029481:Bronchitis, Chronic; D004646:Emphysema; D006801:Humans; D008168:Lung; D011656:Pulmonary Emphysema / Q000209:etiology*
BRONCHITIS; EMPHYSEMA, PULMONARY/etiology and pathogenesis