Surgical masks vs N95 respirators for preventing influenza.
Clynes
Neville
N
D006801:Humans; D017758:Infectious Disease Transmission, Patient-to-Professional / Q000517:prevention & control*; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission; D008397:Masks; D016032:Randomized Controlled Trials as Topic; D015203:Reproducibility of Results; D012107:Research Design; D012134:Respiratory Protective Devices; D012306:Risk