Kozlov, A. I.
Vershubsky, G. G.
Article History
Received: 2 February 2019
Revised: 2 April 2019
Accepted: 22 May 2019
First Online: 1 November 2019
COMPLIANCE WITH ETHICAL STANDARDS
: The authors report no conflicts of interest related to the implementation of the research and publication of its results. This article does not contain any studies involving animals or human participants performed by any of the authors.
: <i>Contribution to the study</i><b><i>.</i></b> The authors made an equal contribution to the collection of materials, their treatment during the study and the creation of the text.