Which type of face mask is most effective against COVID-19?

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Which type of face mask is most effective against COVID-19?
The Lancet - Most comprehensive study to date provides evidence on optimal physical distancing, face masks, and eye protection to prevent spread of # COVID19
Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
Which type of face mask is most effective against COVID-19?
Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
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Which type of face mask is most effective against COVID-19?
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