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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81372180)
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Article History
Received: 21 May 2021
Accepted: 17 July 2021
First Online: 2 August 2021
Declarations
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: Because this study was a bibliometric analysis, ethical approval was not obtained.
: All authors agreed with the content and gave explicit consent to submit and they obtained consent from the responsible authorities at the institute/organization where the work has been carried out.
: The authors declare no competing interests.
