Funding for this research was provided by:
National Natural Science Foundation of China (81703177, 81472925, 81673112)
the Key projects of international cooperation among governments in scientific and technological innovation (2016YFE0119100)
the Natural Science Basic Research Plan in Shaanxi Province of China (2017JZ024)
the Fundamental Research Funds for the Central Universities.
Text and Data Mining valid from 2020-02-03
Received: 11 July 2019
Accepted: 6 November 2019
First Online: 3 February 2020
Ethics approval and consent to participate
: There is no ethical statement here.
: All authors have consented to publication of this manuscript.
: The authors declare that they have no competing interests.