Lung Cancer Screening with Sputum Cytologic Examination, Chest Radiography, and Computed Tomography

1	Exp lung neoplasms or lung cancer.mp (mp = text words from title and abstracts) bronchogenic carcinoma pulmonary coin lesions Pancoast's syndrome pulmonary blastoma
2	Exp mass screening or screen.mp genetic screening mass chest x-ray multiphasic screening mandatory testing
3	1 and 2
4	Exp clinical trials or clinical trials.mp clinical trials, phase 1 through 4 controlled clinical trials multicenter studies
5	Cohort studies.mp
6	Exp epidemiologic studies or epidemiologic studies.mp case-control studies cohort studies longitudinal studies followup studies prospective studies cross-sectional studies seroepidemiologic studies
7	Review$.mp
8	4 or 5 or 6 or 7
9	3 and 8
10	Limit 9 to human
11	Limit 10 to English (foreign-language articles that had English abstracts were included)