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Authors
Li, Yilun
Fan, Shuxin
Li, Kun
Zhang, Yue
Dong, Li
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Funding
Funding for this research was provided by:
Beijing Municipal Science and Technology Commission (D171100007117001, D171100007217003)
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Article History
Accepted: 17 November 2020
First Online: 26 November 2020
Compliance with ethical standards
:
: All data were collected in public space and no ethical issues encountered.
: Not applicable.
: The authors have no conflicts of interest to declare that are relevant to the content of this article.
