Wei, Lian-suo
Hu, Xian-cheng
Guo, Yuan
Funding for this research was provided by:
the National Natural Science Foundation of China under Grant (61502037)
Article History
Received: 27 February 2019
Accepted: 10 April 2019
First Online: 2 May 2019
Competing interests
: The authors declare that they have no competing interests.
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