A recent Cochrane Review is being used as evidence that masks are not effective at preventing transmission of SARS-CoV-2 but there are several limitations to the study. This is a meta-analysis which is a study design that combines data from multiple studies and re-analyzes them in an attempt to increase sample size and statistical power. However, the quality of the meta-analysis hinges upon both the quality of the studies being included, as well as their comparability. If you combine studies tha
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