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Authors
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Funding
Funding for this research was provided by:
Shandong Province Higher Educational Science and Technology Program (J15LN06)
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License Information
Text and Data Mining valid from 2018-05-16
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More Information
Article History
Received: 11 October 2017
Accepted: 18 April 2018
First Online: 16 May 2018
Competing interests
: The authors declare that they have no competing interests.
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