Funding for this research was provided by:
National Natural Science Foundation of China (81703582)
National Natural Science Foundation of China (81573432)
National Natural Science Foundation of China (81503072)
National Natural Science Foundation of China (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).