Yang, Yongchang
Wu, Yubin http://orcid.org/0000-0002-2932-8275
Article History
Received: 25 August 2021
Accepted: 18 February 2022
First Online: 5 March 2022
Declarations
:
: NHANES study protocols were approved by the research ethics review board of the National Center for Health Statistics. Written informed consent was obtained from the legal guardians of participants younger than 18 years of age.
: Not applicable.
: The authors declare that they have no conflict of interest.