Funding for this research was provided by:
Russian State Scientific Project (0324-2018-0018)
Text and Data Mining valid from 2018-11-13
Received: 9 August 2018
Accepted: 29 October 2018
First Online: 13 November 2018
Compliance with ethical standards
: The authors declare that there is no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.