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Risk factors affecting COVID-19 vaccine effectiveness identified from 290 cross-country observational studies until February 2022: a meta-analysis and meta-regression.
BMC Med. 2022 Nov 25;20(1):461. doi: 10.1186/s12916-022-02663-z.
BMC Med. 2022.
PMID: 36434597
Free PMC article.
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