Nikiforova, E. M.
Kasimov, N. S.
Kosheleva, N. E.
Article History
Received: 16 January 2020
Revised: 16 January 2020
Accepted: 16 January 2020
First Online: 12 May 2020
COMPLIANCE WITH ETHICAL STANDARDS
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: The authors declare that they have no conflict of interest.