Funding for this research was provided by:
Ministry of Education and Science of Ukraine (Bg41Nr, M/26-2018)
Article History
Received: 21 November 2018
Revised: 26 December 2018
Accepted: 27 December 2018
First Online: 11 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.