Search Cochrane systematic reviews via PubMed.
Finds Cochrane Database of Systematic Reviews articles matching
your query. Returns PubMed IDs, titles, and publication dates.
Use get_review_detail with a PMID to get the full abstract.
Args:
query: Search terms for finding reviews (e.g. 'diabetes exercise',
'hypertension treatment', 'childhood vaccination safety').
limit: Maximum number of results to return (default 20, max 100).
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