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Authors
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Funding
Funding for this research was provided by:
National Science Foundation of China (NSFC No. U1604281, 81672138)
National Basic Research Program of China (973 Program) (973 Program No. 2012CB934002, 863 Program No. 2012AA02A203, 2012AA02A209)
National Key Research and Development Programme of China (2018YFA0208902)
National Key Scientific Instrument Special Programme of China (2011YQ03013405)
Beijing Science Foundation of China (BJSFC No. 7171008)
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Article History
Received: 19 September 2019
Accepted: 10 October 2019
First Online: 31 October 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
