Funding for this research was provided by:
National Natural Science Foundation of China (61604132, 61505033, 11374296, 21601159)
National Science Fund for Distinguished Young Scholars (National Science Fund for Distinguished Young Scholars)
Text and Data Mining valid from 2019-04-15
Received: 17 January 2019
Accepted: 19 March 2019
First Online: 15 April 2019
: The authors declare that they have no competing interests.
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