Surgical mask vs N95 respirator for preventing influenza among health care workers: a randomized trial.
Loeb M; Dafoe N; Mahony J; John M; Sarabia A; Glavin V; Webby R; Smieja M; Earn DJ; Chong S; Webb A; Walter SD; JAMA, 2009, vol. 302, issue 17, p 1865, ISSN 15383598. ISBN 15383598.

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