Cowling, B J Face masks to prevent transmission of influenza virus: a systematic review. [electronic resource] - Epidemiology and infection Apr 2010 - 449-56 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Review; Systematic Review ISSN: 1469-4409 Standard No.: 10.1017/S0950268809991658 doi Subjects--Topical Terms: HumansInfection Control--methodsInfectious Disease Transmission, Vertical--prevention & controlInfluenza, Human--epidemiologyMasks--statistics & numerical dataRespiratory Protective Devices--statistics & numerical data