Visualizing droplet dispersal for face shields and masks with exhalation valves.

Phys Fluids (1994) · 2020 · PMC7497716 · PMID 32952381

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an increasing trendno p-value reported

However, there is an increasing trend of people substituting regular cloth or surgical masks with clear plastic face shields and with masks equipped with exhalation valves.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.