Funding for this research was provided by:
National Natural Science Foundation of China (61376068, 11304132, 11304133, 11405144)
Fundamental Research Funds for the Central Universities (lzujbky-2017-178 and lzujbky-2017-181)
Text and Data Mining valid from 2018-08-15
Received: 3 March 2018
Accepted: 6 August 2018
First Online: 15 August 2018
: The authors declare that they have no competing interests.
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