He, Jinshen
Li, Jinfei
Wu, Song
Wang, Jiaoju
Tang, Qi
Article History
Received: 19 June 2022
Accepted: 19 December 2022
First Online: 3 February 2023
Declarations
:
: Approval of this study was obtained from the ethics review board of the National Center for Health Statistics. All participants gave written informed consent. The experimental protocol was established according to the ethical guidelines of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.