| http://www.w3.org/ns/prov#value | - External Validity: Good.Factors of uncertain association with riskDietary factorsBased on equivocal evidence, the observed inverse associations between lung cancer and dietary factors, such as fruit and vegetable consumption, are difficult to disentangle from cigarette smoking.Magnitude of Effect: Inverse association, moderate magnitude, but difficult to determine if true cause-effect association
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