Ptichnikov, A. V.
Shvarts, E. A.
Kuznetsova, D. A.
Article History
Received: 25 April 2021
Revised: 25 April 2021
Accepted: 26 April 2021
First Online: 7 September 2021
COMPLIANCE WITH ETHICAL STANDARDS
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: The authors declare that they have no conflict of interest.