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Mask study author: 'More likely than not they don't work'
"Masks have become political" says an author of the Cochrane Library study on mask effectiveness. "I can only tell you what the science is....I can't tell you whether they work or don't work. But it's more likely than not that they don't work."
09:19
- Source:
CNN
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Mask study author: 'More likely than not they don't work'
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