Declarations:
Funding: This research is supported by the Major Project of the National Social Science Fund of China: ”Research on the Theoretical System, International Experience and Chinese Path of Evidence-based Social Science” (Project No. 19ZDA142);
Role of Funding Source: The funder had no further role in study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the paper for publication.
Conflict of interests: The all authors declare that there is no conflict of interests.
Acknowledgements: None.
Authors’ contributions: KLG, JWL, and JYL conceived and designed the study. NC, YFL and JYL selected the articles and extracted the data. KLG and JWL analyzed the data. JWL completed some background writing and KLG wrote the first draft of the manuscript. All authors were involved in the interpretation of data and contribution to the writing of the final manuscript.