Yue, Zhang
Liang, Hang
Qin, Xigang
Ge, Yang
Xiang, Nan
Liu, Erpeng
Article History
Received: 2 November 2021
Accepted: 25 March 2022
First Online: 6 April 2022
Declarations
:
: This study is a secondary analysis of the data from the CLHLS. The CLHLS study was approved by the Ethics Committee of Peking University (IRB00001052–13074). The participants provided their written informed consent to participate in this study. And informed consent was obtained from literate participants and legal guardian(s)/next of kin of illiterate participants. All methods were performed in accordance with the guidelines and regulations.
: Not applicable.
: The authors declare no competing interests.