DOI:
10.1055/s-00000020
Geburtshilfe und Frauenheilkunde
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References
Feng S, Shen C, Xia N. et al.
Rational use of face masks in the COVID-19 pandemic.
Lancet 2020;
DOI: 10.1016/S2213-2600(20)30134-X.
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