Lu, Han
Wang, Limin
Zhou, Weijiao
Jin, Shida
Chen, Hongbo
Su, Yi
Li, Nan
Shang, Shaomei
Article History
Received: 16 September 2021
Accepted: 18 February 2022
First Online: 5 March 2022
Declarations
:
: The CHARLS was approved by the Ethical Review Committee of Peking University, and all participants signed informed consent at the time of participation. All methods were performed according to the Declaration of Helsinki.
: Not applicable.
: The authors declare no conflict of interest.