Article History
Received: 1 February 2018
Accepted: 13 March 2019
First Online: 25 March 2019
Compliance with ethical standards
:
: All authors declare that they have no conflicts of interest.
: Informed consent was obtained from all participants when participating in NHANES III.
: The protocols for the conduct of NHANES III were approved by the institutional review board of the National Center for Health Statistics, US Centers for Disease Control and Prevention.
: No additional unpublished data from the study are available. However, NHANES data are publically available.