Screening for bronchogenic carcinoma.
D000368:Aged; D002283:Carcinoma, Bronchogenic / Q000453:epidemiology*; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology*; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008875:Middle Aged; D012907:Smoking