Chetina, E. V.
Markova, G. A.
Sharapova, E. P.
Article History
Received: 14 February 2019
Revised: 5 August 2019
Accepted: 7 August 2019
First Online: 18 May 2020
COMPLIANCE WITH ETHICAL STANDARDS
: The study did not involve humans and animals as research objects.
: The authors declare that they have no conflict of interest.