Shushkova, N. A.
Novikova, S. E.
Zgoda, V. G.
Article History
Received: 8 November 2019
Revised: 25 November 2019
Accepted: 27 November 2019
First Online: 18 May 2020
COMPLIANCE WITH ETHICAL STANDARDS
: The study did not involve humans or animals as research objects.
: The authors declare that they have no conflict of interest.