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World Health Organization (WHO) (2009). Advice on the Use of Masks in the Community Setting in Influenza A (H1N1) Outbreaks.
https://cdn.who.int/media/docs/default-source/influenza/advice-on-the-use-of-masks-in-the-community-setting-in-influenza-a-(h1n1)-outbreaks.pdf?sfvrsn=24a45a95_1&download=true

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