Burkin, A. A.
Kononenko, G. P.
Georgiev, A. A.
Georgieva, M. L.
Article History
Received: 8 November 2019
Revised: 5 February 2020
Accepted: 24 September 2020
First Online: 5 April 2021
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.