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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81570303, 81370297)
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Article History
Received: 10 January 2018
Accepted: 1 March 2018
First Online: 10 March 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This study does not involve human participants or animals.
