Funding for this research was provided by:
Ministry of Education and Science of Russian Federation (#14.Y26.31.0024)
Nazarbayev University grant (090118FD5311)
Russian Fundamental Scientific Research Project (0310 2018 0009, 0310 2018 0009)
Article History
Received: 8 October 2018
Revised: 24 December 2018
Accepted: 28 December 2018
First Online: 5 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.