He, Li
Xi, Xiaojing
Article History
Received: 24 January 2022
Accepted: 30 July 2022
First Online: 23 August 2022
Declarations
:
: The National Center for Health Statistics (NCHS) Ethics Review Committee granted ethics approval. All individuals provided written informed consent before participating in the study. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.