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Authors
Zhao, Wei
Wu, Huaiqin
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Funding
Funding for this research was provided by:
the National Natural Science Foundation of China and High level talent project of Hebei Province of China ((61573306),(C2015003054))
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Article History
Received: 22 January 2018
Accepted: 28 May 2018
First Online: 20 June 2018
Competing interests
: The authors declare that they have no competing interests.
