The Philadelphia Pulmonary Neoplasm Research Project. The risk of lung cancer in relation to symptoms and roentgenographic abnormalities.
D000368:Aged; D002908:Chronic Disease; D003371:Cough / Q000150:complications; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008175:Lung Neoplasms / Q000150:complications / Q000000981:diagnostic imaging / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D010414:Pennsylvania; D011859:Radiography; D012306:Risk; D012907:Smoking / Q000150:complications; D013997:Time Factors