Funding for this research was provided by:
National Natural Science Foundation of China (81703582, 81573432)
National Natural Science Foundation of China (81503072, 81373413)
Ministry of Education of the People's Republic of China (NCET-10-0409)
Hubei Provincial Natural Science Foundation of China (2016CFB153)
Article History
First Online: 8 May 2019
Compliance with Ethical Standards
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: TZ, FB, LC, QW and SJ have no conflicts of interest that are directly relevant to the content of this article.
: This work was supported by grants from the National Natural Science Foundation of China (81703582, 81573432, 81503072 and 81373413), Ministry of Education of China (NCET-10-0409), and Hubei Provincial Natural Science Foundation of China (2016CFB153).