An epidemiological study in lung cancer.
D000328:Adult; D000368:Aged; D004812:Epidemiologic Methods; D004813:Epidemiology; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology* / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D012140:Respiratory Tract Diseases / Q000150:complications; D012907:Smoking; D013223:Statistics as Topic