Rak, A. Ya.
Trofimov, A. V.
Ischenko, A. M.
Article History
Received: 8 January 2019
Revised: 1 March 2019
Accepted: 4 March 2019
First Online: 14 August 2019
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interests</i>. The authors declare that they have no conflict of interest.