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This page is a summary of: Ratio of asymptomatic COVID-19 cases among ascertained SARS-CoV-2 infections in different regions and population groups in 2020: a systematic review and meta-analysis including 130 123 infections from 241 studies, BMJ Open, December 2021, BMJ,
DOI: 10.1136/bmjopen-2021-049752.
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