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Face masks considerably reduce Covid-19 cases in Germany (12/2020)

Face masks considerably reduce Covid-19 cases in Germany (12/2020)

4 years ago
Anonymous $y15ULlV7sG

https://www.pnas.org/content/early/2020/12/02/2015954117

Face masks considerably reduce Covid-19 cases in Germany (12/2020)

Dec 4, 2020, 9:13am UTC
$y15ULlV7sG
https://www.pnas.org/content/early/2020/12/02/2015954117