COMMENTARY: Masks-for-all for COVID-19 not based on sound data

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Acoustic voice characteristics with and without wearing a facemask

Mask Up: Stop the spread of COVID-19

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Real-time pandemic data from Carnegie Mellon's CovidCast shows why you should wear a mask - The Washington Post

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Why every state should have a mask mandate, in 4 charts - Vox

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COMMENTARY: What can masks do? Part 1: The science behind COVID-19 protection

Puget Sound-area health care facilities will continue requiring masks