1. World Health Organization. Temporary recommendations dated February 2, 2021 "COVID-19: occupational health and safety of medical workers". https://clck.ru/375Ehk (in Russian).
2. Methodological recommendations of MR 3.1.0170-20 "Epidemiology and prevention of COVID-19" (in Russian).
3. Letter of the Federal Service for Supervision of Consumer Rights Protection and Human Welfare dated April 11, 2020 No. 02/6673-2020-32 "On the direction of recommendations on the use of PPE for various categories of citizens at risk of infection with COVID-19" (in Russian).
4. Kirillov V.F., Filin A.S., Chirkin A.V. Оverview of industrial testing outcome of respiratory organs personal protection equipment. Toxicological Review. 2014; 6: 44–49 (in Russian).
5. Noti J.D., Lindsley W.G., Blachere F.M., Cao G., Kashon M.L., Thewlis R.E., McMillen C.M., King W.P., Szalajda J.V., Beezhold D.H. Detection of Infectious Influenza Virus in Cough Aerosols Generated in a Simulated Patient Examination Room. Clinical Infectious Diseases. 2012; 54(11): 1569–1577. https://doi.org/10.1093/cid/cis237