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6993452 
Journal Article 
A cluster randomised trial of cloth masks compared with medical masks in healthcare workers 
Macintyre, CR; Seale, H; Tham Chi Dung; Nguyen Tran Hien; Phan Thi Nga; Chughtai, AA; Rahman, B; Dwyer, DE; Wang, Q 
2015 
1 
BMJ Open
EISSN: 2044-6055 
5 
4 
English 
25903751 
WOS:000354705000022 
The aim of this study was to compare the efficacy of cloth masks to medical masks in hospital healthcare workers (HCWs). The null hypothesis is that there is no difference between medical masks and cloth masks.