Smirnov, N. G.
Kropacheva, Yu. E.
Article History
Received: 4 March 2019
Revised: 10 April 2019
Accepted: 20 April 2019
First Online: 23 September 2019
COMPLIANCE WITH ETHICAL STANDARDS
: The authors declare that they have no conflict of interest. This article does not contain any studies involving animals performed by the authors.