Funding for this research was provided by:
the Hundred Talents Program of the Chinese Academy of Sciences (Y329671K01)
funding Project of Sino-Africa Joint Research Center, Chinese Academy of Sciences (Y623321K01)
Text and Data Mining valid from 2019-04-05
Received: 6 November 2018
Accepted: 25 March 2019
First Online: 5 April 2019
Compliance with Ethical Standards
: The authors declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.