Tan, Jian-Yu
Zeng, Qing-Lian
Ni, Meng
Zhang, Ying-Xiao
Qiu, Tian
Article History
Received: 12 December 2021
Accepted: 8 April 2022
First Online: 20 April 2022
Declarations
:
: This study was carried out in accordance with the Declaration of Helsinki as revised 1989. The 2018 wave of CLHLS study was approved by the Biomedical Ethics Committee of Peking University (IRB00001052–13074). All participants or their legal representatives signed written consent forms in the baseline and follow-up surveys.
: Not applicable.
: Not applicable.