Nickel, V. V.
Efremova, V. P.
Article History
Received: 9 July 2019
Revised: 10 September 2019
Accepted: 17 September 2019
First Online: 18 July 2020
CONFLICT OF INTEREST
: <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.