DOI:
10.1055/s-00000031
Klinische Monatsblätter für Augenheilkunde
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References
Klompas M, Morris CA, Sinclair J. et al.
Universal Masking in Hospitals in the Covid-19 Era.
N Engl J Med 2020;
DOI: 10.1056/NEJMp2006372.
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