Funding for this research was provided by:
National Natural Science Foundation of China (71462009)
Education Department of Jiangxi Province (GJJ190292)
Jiangxi Province Teaching Reform Research Project (JXJG-18-4-29)
Natural Science Foundation of Jiangxi Province (20192BAB207010)
Article History
First Online: 18 February 2020
Compliance with ethical standards
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: The author declares no conflict of interest.