Voronkov, Alexander http://orcid.org/0000-0001-7753-915X
Ivanova, Tatiana http://orcid.org/0000-0003-2528-4946
Kumachova, Tamara http://orcid.org/0000-0001-6977-5451
Article History
Received: 4 October 2019
Revised: 3 January 2020
Accepted: 6 January 2020
First Online: 3 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.