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Authors
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Funding
Funding for this research was provided by:
National Key R&D Program of China (2017YFB0802400)
National Science Foundation of China (61373171)
The 111 Project (B08038)
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Article History
Received: 22 January 2019
Accepted: 16 April 2019
First Online: 10 June 2019
Competing interests
: The authors declare that they have no competing interests.
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