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Authors
He, Zhisong http://orcid.org/0000-0002-1502-4801
Yu, Qianhui
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (91331203)
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Article History
Received: 24 November 2017
Accepted: 8 April 2018
First Online: 17 April 2018
Competing interests
: The authors declare that they have no competing interests.
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