Funding for this research was provided by:
National Natural Science Foundation of China (41701452)
The National Key Research and Development Program of China (2017YFB0504203)
The Strategic Priority Research Program of the Chinese Academy of Sciences (XDA19030301)
Article History
First Online: 1 April 2019
Compliance with ethical standards
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: On behalf of all authors, the corresponding author states that there is no conflict of interest.