Savinov, I. A.
Article History
Received: 26 December 2019
Revised: 9 January 2020
Accepted: 12 January 2020
First Online: 30 June 2020
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interests</i>. The authors declare that they have no conflicts 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.