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Continue to ChatMasks and health: from the 19th century to COVID-19 https://blogs.imperial.ac.uk/imperial-medicine/2020/04/27/masks-and-health-from-the-19th-century-to-covid-19/
Masks and health: from the 19th century to COVID-19 https://blogs.imperial.ac.uk/imperial-medicine/2020/04/27/masks-and-health-from-the-19th-century-to-covid-19/