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Where does an ecological study rank in the Hierarchy of Evidence? A. Above a cross-sectional study, but below a cohort study B. Above a randomized

Where does an ecological study rank in the Hierarchy of Evidence? A. Above a cross-sectional study, but below a cohort study B. Above a randomized controlled trial, but below a systematic review C. At the very bottom, below all other study designs D. Above a case/control study, but below a randomized controlled trial

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