Li, Xianxian
Wang, Lili
Yang, Luming
Liu, Xianghong
Liu, Henglang
Mu, Yandong
Article History
Received: 3 July 2023
Accepted: 19 December 2023
First Online: 5 January 2024
Declarations
:
: All study participants gave written informed consent in accordance with the National Center for Health Statistics’ Research Ethics Review Board (Protocol #2009–14) and study ethic guidelines at the Centers for Disease Control and Prevention. Parental consent was obtained for participates age 15 and below. All protocols were approved by the National Center for Health Statistics Research Ethics Review Board.
: Not applicable.
: The authors declare no competing interests.