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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (31000069)
the Key Project on Social Development of Science and Technology in Shaanxi Province (2017ZDXM-SF-105)
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Article History
Received: 7 April 2020
Revised: 30 June 2020
Accepted: 9 July 2020
First Online: 18 July 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest.
