Funding for this research was provided by:
National Natural Science Foundation of China (61471028)
National Natural Science Foundation of China (61871023)
National Natural Science Foundation of China (61572070)
Fundamental Research Funds for the Central Universities (2017JBM004)
Fundamental Research Funds for the Central Universities (2016JBZ003)
Article History
Received: 7 September 2018
Accepted: 31 October 2018
First Online: 16 November 2018
Competing interests
: The authors declare that they have no competing interests.
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