Using of protective masks after the cancelling of the COVID-19 pandemic restrictions: Prospective cohort research by E. Yu. Pylaeva, D. V. Orlov, N. A. Marudenkov, E. A. Koltsova, M. G. Tataryan, A. A. Litsev, N. N. Zvereva, I. M. Spivak, O. V. Shamsheva, M. A. Sayfullin

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