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Authors
Zhuang, Yan
Li, Laifu
Sun, Jingyan
Zhang, Yanqi
Dai, Fei
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Article History
Received: 29 December 2024
Accepted: 14 February 2025
First Online: 28 February 2025
Declarations
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: This is an observational study. This study protocol was reviewed and approved by the U.S. Centers for Disease Control and Prevention's National Center for Health Statistics Ethics Review Board, approval number: Protocol #2005–06 (January 1, 2005- December 31, 2010). Written informed consent was obtained from participants prior to the study.
: Not applicable.
: The authors declare no competing interests.
