Barbash, V. A. http://orcid.org/0000-0002-7933-6038
Yashchenko, O. V. http://orcid.org/0000-0003-3716-8707
Article History
Received: 14 December 2018
Accepted: 18 December 2019
First Online: 2 January 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.