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Confounding
Cohort study
Study design
Randomized controlled trial
Key terms: studies do data link risk low cancer factor hrt might effect control disease chd trials individual analysis cause evidence population income cannot research rates problem results cohort relationship aggregated census association confirmed smoking involve tobacco benefit randomized lung cancer substantial confounding significant those who mechanism secondary ecological differences link between infant mortality studies often relationship between Search external links cited by footnotes on Wikipedia page Case-control study: |
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