Risk factors in the development of chronic obstructive pulmonary disease.
D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000209:etiology* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D012306:Risk; D012737:Sex Factors; D012907:Smoking