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The Centre for Evidence-Based Medicine (CEBM) at Oxford University develops, promotes and disseminates better evidence for health care.

Systematic reviews

OCEBM Levels of Evidence

Explanation of the 2011 OCEBM Levels of Evidence

Levels of Evidence: An introduction

This must be read before using the Levels: no evidence ranking system or decision tool can be used without a healthy dose of judgement and thought.

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