Chen, Feng
Zhang, Yu
Chen, Shaohe
Article History
Received: 22 August 2023
Accepted: 18 October 2023
First Online: 24 October 2023
Declarations
:
: The National Center for Health Statistics (NCHS) Ethics Review Board and the Centers for Disease Control and Prevention (CDC) both gave their approval to the survey protocol (Protocol #2005-06, Continuation of Protocol #2005-06, Protocol #2011-17, Continuation of Protocol #2011-17), and this study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). All participants gave written informed consent.
: Informed consent for publication was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.