Funding for this research was provided by:
National Natural Science Foundation of China (61571167)
National Natural Science Foundation of China-Yunnan Joint Fund (61102084, 61601145, 61471142)
Text and Data Mining valid from 2019-03-29
Received: 17 October 2018
Accepted: 4 March 2019
First Online: 29 March 2019
: The authors declare that they have no competing interests.
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