Yang, Yi https://orcid.org/0000-0001-9964-3492
Zhang, Ke
Funding for this research was provided by:
the National Social Science Foundation of China Western Project (15XJL009)
the Natural Science Basic Research Program of Shaanxi (2020JM-467)
Soft Science Research Program of Shaanxi-Joint Project ( (2018KRLY07)
Article History
Received: 2 February 2021
Accepted: 10 May 2021
First Online: 12 June 2021
Declarations
:
: Not applicable.
: Not applicable.
: The authors declare no competing interests.