Funding for this research was provided by:
National High-tech Research and Development Program (2016YFC0303100, 2017YFF0105700)
Young Scientists Fund (61531001, 41804071)
Text and Data Mining valid from 2020-01-13
Received: 11 February 2019
Accepted: 26 November 2019
First Online: 13 January 2020
: The authors declare that they have no competing interests.