Liu, Huan
Article History
Received: 17 October 2021
Accepted: 18 April 2022
First Online: 26 April 2022
Declarations
:
: We declare that all methods were carried out in accordance with relevant guidelines and regulations. All experimental protocols were approved by Institutional Review Board at Peking University. And we confirmed that informed consent was obtained from all subjects or, if subjects are under 18, from a parent and/or legal guardian. The IRB approval number for the main household survey, including anthropometrics, is IRB00001052–11015; the IRB approval number for biomarker collection, was IRB00001052–11014.During the fieldwork, each respondent who agreed to participate in the survey was asked to sign two copies of the informed consent, and one copy was kept in the CHARLS office, which was also scanned and saved in PDF format.
: Not applicable.
: The authors declare that they have no competing interests.