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Authors
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Funding
Funding for this research was provided by:
China Postdoctoral Science Foundation funded project (2012M521673)
Fundamental Research Funds for the Central Universities (106112014CD165503, CDJRC10160011, CDJZR12160007)
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Article History
Received: 25 May 2019
Accepted: 30 October 2019
First Online: 17 November 2019
Compliance with ethical standards
:
: Luo Xu, Zhirui Guo and Xiao Liu declare that they have no conflict of interest.
