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Authors
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Funding
Funding for this research was provided by:
the Major National Scientific Instrument and Equipment Development Project (No. 2013YQ160551)
the National Natural Science Foundation of China (No. 81571754)
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Article History
Received: 23 October 2018
Accepted: 29 July 2019
First Online: 14 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
