DOI:
10.1055/s-00025477
International Archives of Otorhinolaryngology
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References
MacIntyre CR, Seale H, Dung TC. , et al.
A cluster randomised trial of cloth masks compared with medical masks in healthcare workers.
BMJ Open 2015;
5 (04) e006577 . Doi: 10.1136/bmjopen-2014-006577
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