Knyazeva, S. G.
Hantemirova, E. V.
Article History
Received: 5 February 2019
Revised: 21 March 2019
Accepted: 9 April 2019
First Online: 6 February 2020
COMPLIANCE WITH ETHICAL STANDARDS
: The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.