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Authors
Qun, Gao
He, Sun
Bo, Song
Jiangli, Di
Tao, Xu
Shuo, Wang
Zechun, Lu
Ailing, Wang
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Article History
Received: 11 May 2022
Accepted: 13 October 2022
First Online: 18 January 2023
Declarations
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: All research activities were performed in accordance with relevant guidelines and regulations (Declaration of Helsinki). Participation was voluntary, and written informed consent was unenforceable according to approved survey protocol. Ethical approval was granted by Ethics Review Committee of National Center for Women and Children's Health Chinese Center for Disease Control and Prevention (Approval No.: FY2016-015), which had been approved by periodic review in 2019.
: Not applicable.
: Authors declare no direct or indirect financial or personal conflict of interest related to the submitted work.
