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4 “... (RESULTS): Fifty total studies (30 trials and 20 cohort studies) with a total of 94,168 participants were...”

5 “... by the USPSTF. DATA SYNTHESIS (RESULTS): 22 trials (N=90,624) with followup from 6 months to 6 years compared...”

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7 “... were excluded from the analysis (2.0% vs. 0.9%, p=0.04); almost all lung cancers occurred in former...”