Yang, Zhiming
Wang, Zhen
Yuan, Xiao-Chen
Qi, Yu
Zhang, Yunquan
Wang, Weiqing
He, Fanglin
Li, Jing
Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (FRF-BR-20-04A)
Article History
Received: 15 October 2020
Accepted: 13 May 2021
First Online: 25 May 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: All authors agree to publish.
: Ethics approval was obtained from the Institute of Social Science Survey (Peking University).