Tomaev, V. V.
Polishchuk, V. A.
Vartanyan, T. A.
Vasil’ev, E. A.
Article History
Received: 6 February 2018
Revised: 31 January 2019
Accepted: 5 February 2019
First Online: 2 July 2019
COMPLIANCE WITH ETHICAL STANDARDS
: The authors declare that they have no conflict of interest.