Funding for this research was provided by:
Chongqing Federation of Social Sciences (2019YBYY132)
Article History
Received: 3 May 2021
Accepted: 15 June 2021
First Online: 1 July 2021
Declarations
:
: We confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us. We understand that the Corresponding Author Dr. Jun Cheng is the sole contact for the Editorial process (including Editorial Manager and direct communications with the office). He is responsible for communicating with the other authors about progress, submissions of revisions and final approval of proofs. We confirm that we have provided a current, correct email address which is accessible by the Corresponding Author.
: The authors declare that they have no competing interests.