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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (51675536, 51574276)
Fundamental Research Funds for the Central Universities (18CX02084A)
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Article History
Received: 22 April 2019
Revised: 8 October 2019
Accepted: 19 November 2019
First Online: 5 December 2019
Competing Interests
: The authors declare that they have no competing interests.
