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Authors
Li, Lin
Sun, Huafei
Ge, Weigao
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (61179031)
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Article History
Received: 21 September 2018
Accepted: 9 December 2018
First Online: 5 January 2019
Competing interests
: The authors declare that they have no competing interests.
