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Authors
Li, Tu
Yan, Wang
Ping, Li
Fang, Peng
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Funding
Funding for this research was provided by:
Teaching Reform Project Fund of Scientific Research Fund of Guangdong Provincial Education Department under (416YCQ01)
Teaching Reform Project Fund of Hunan province (XJK17CXX002)
Scientific Research Fund of Hunan Provincial Education Department (17C0295)
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Article History
Received: 20 December 2018
Accepted: 25 April 2019
First Online: 22 May 2019
Competing interests
: The authors declare that they have no competing interests.
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