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Authors
Ji, Yiman
Feng, Yiping
Wu, Sijia
Wu, Yutong
Wang, Jiongjiong
Zhao, Xiangjuan
Liu, Yunxia
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Article History
Received: 7 April 2022
Accepted: 6 January 2023
First Online: 12 January 2023
Declarations
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: All respondents gave informed written consent before they were interviewed, and ethical approval for collecting data on human subjects was obtained and renewed annually at the Peking University Institutional Review Board (IRB00001052–11015). All methods in this study were performed in accordance with the guidelines of the Declaration of Helsink.
: Not applicable.
: The authors declare that they have no competing interest.
