Surgical masks vs N95 respirators for preventing influenza.
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D005374:Filtration; D006801:Humans; D017758:Infectious Disease Transmission, Patient-to-Professional / Q000517:prevention & control*; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission; D008397:Masks / Q000592:standards*; D009726:Nurses; D015203:Reproducibility of Results