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Face masks considerably reduce COVID-19 cases in Germany.
Mitze T, Kosfeld R, Rode J, Wälde K. Mitze T, et al. Proc Natl Acad Sci U S A. 2020 Dec 22;117(51):32293-32301. doi: 10.1073/pnas.2015954117. Epub 2020 Dec 3. Proc Natl Acad Sci U S A. 2020. PMID: 33273115 Free PMC article.