The Philadelphia Pulmonary Neoplasms Research Project.
D000367:Age Factors; D000368:Aged; D006801:Humans; D008137:Longitudinal Studies; D008175:Lung Neoplasms / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D010414:Pennsylvania; D011446:Prospective Studies; D012306:Risk; D012907:Smoking; D013997:Time Factors