Funding for this research was provided by:
National Natural Science Foundation of China (61762003)
CAS “Light of West China” Program (2018QNXZ0024)
First-class discipline construction in Ningxia universities: Electronic Science and Technology (NXYLXK2017A07)
Article History
First Online: 23 September 2020
Compliance with ethical standards
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: The authors declared that they have no conflicts of interest to this work.