Voitsekhovskaja, O. V.
Article History
Received: 29 March 2018
Revised: 5 June 2018
Accepted: 13 June 2018
First Online: 6 June 2019
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.