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Bae, S., Kim, M. C., Kim, J. Y., Cha, H. H., Lim, J. S., Jung, J., … Kim, S. H. (2020, July 7). Effectiveness of Surgical and Cotton Masks in Blocking SARS-CoV-2: A Controlled Comparison in 4 Patients. Annals of Internal Medicine. American College of Physicians. https://doi.org/10.7326/M20-1342
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