Shakhmatova, E. Yu.
Ubugunov, L. L.
Sympilova, D. P.
Article History
Received: 8 November 2019
Revised: 8 November 2019
Accepted: 25 September 2020
First Online: 13 July 2021
COMPLIANCE WITH ETHICAL STANDARDS
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: The authors declare that they have no conflict of interest.