Funding for this research was provided by:
National Natural Science Foundation of China (61561024)
National Natural Science Foundation of China (61703170)
Science and Technology Research Project of Jiangxi Province (GJJ160930)
Science and Technology Research Project of Jiangxi Province (GJJ160631)
Article History
First Online: 16 August 2018
Compliance with ethical standards
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: The authors declare that there is no conflict of interest regarding the publication of this paper.