Leonova, I. N.
Article History
Received: 5 April 2019
Revised: 13 May 2019
Accepted: 29 May 2019
First Online: 21 November 2019
COMPLIANCE WITH ETHICAL STANDARDS
: The authors declare that they have no conflict of interest. This article does not contain any research using animals as an object. This article does not contain any research involving people as an object.