Viktorov, A. G.
Article History
Received: 25 November 2020
Revised: 23 January 2021
Accepted: 2 February 2021
First Online: 2 July 2021
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interest</i>. The authors declare that they have no conflict of interest.
: <i>Statement on the welfare of animals</i>. This article does not contain any studies involving animals performed by any of the authors.