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Contact & corrections.
A useful correction starts with a specific claim and a source that changes the interpretation.
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Prepare a research note
Include the page, the statement in question and the primary source. Explain whether the issue concerns a factual error, an interpretation or newer evidence.
What to include
A precise reference is more useful than a broad endorsement or objection. For a trial result, include the endpoint, population and follow-up. For a registry, distinguish planned outcomes from published results.