Funding for this research was provided by:
National key R&D Program of China (2017YFB1002900)
Received: 2 November 2018
Accepted: 6 February 2019
First Online: 5 March 2019
: No conflict of interest exits in the submission of this manuscript, and the manuscript is approved by all authors for publication. The work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.
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