Leonidov, A. V.
Article History
Received: 5 March 2019
Revised: 5 March 2019
Accepted: 25 December 2019
First Online: 25 June 2020
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interests.</i> The author declares that he has no conflict of interest.
: This article does not contain any studies involving animals or human subjects performed by the author.