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Authors
Zhang, Xiang https://orcid.org/0000-0002-1622-2658
Zhao, Chenguang
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71872012, 71521002)
Beijing Social Science Fund (15JDJGA021)
China Scholarship Council (Liujinfa [2017]5047 and Liujinfa[2018]5023)
Beijing Municipal Education Commission (special funds)
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Article History
Accepted: 8 December 2020
First Online: 3 January 2021
Compliance with ethical standards
:
: These authors declare that they have no conflict of interest.
