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Amazon.com: 60Pcs KF94 Disposable Face Masks, KF94 Mask, Fish Mouth Type Aldult Safety Four Layer Protective Cup Type mask,Comfortable Breathable ,and Protection Rate of 95% , Suitable for all Adults (Pure) :
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Assessing the effect of beard hair lengths on face masks used as personal protective equipment during the COVID-19 pandemic | Journal of Exposure Science & Environmental Epidemiology
Face Masks: Know What Type to Wear and When | Wayne UNC | Goldsboro, NC
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