Funding for this research was provided by:
Российский Фонд Фундаментальных Исследований (РФФИ) (18-34-20064, 19-04-00792, 18-04-01213)
Text and Data Mining valid from 2019-09-12
Received: 25 September 2018
Accepted: 21 August 2019
First Online: 12 September 2019
Ethics approval and consent to participate
: Not applicable.
: All of the authors have consented to publication of the manuscript.
: The authors declare that they have no competing interests.