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Authors
Liu, Xin
An, Jingjing
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Article History
Received: 5 March 2023
Accepted: 26 June 2023
First Online: 18 July 2023
Declarations
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: All authors declare that they have no competing financial interests.
: The study protocol was approved by the Ethics Review Board of National Center for Health Statistics and all participants provided written informed consent. All methods were performed in accordance with the relevant the Declaration of Helsinki.
: Not applicable.
