DOI: 10.1055/s-00034916

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Lyu W, Wehby GL.
Community Use Of Face Masks And COVID-19: Evidence From A Natural Experiment Of State Mandates In The US..
Health Affairs, published online ahead of print June 16th, 2020
https://www.healthaffairs.org/doi/10.1377/hlthaff.2020.00818?cookieSet=1 accessed June 20th 2020

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