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Authors
Song, Keying
Ma, Wanbiao
Guo, Songbai
Yan, Hai
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (11471034)
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Article History
Received: 19 September 2017
Accepted: 4 January 2018
First Online: 23 January 2018
Competing interests
: The authors declare that they have no competing interests.
