Funding for this research was provided by:
National Institute of Environmental Health Sciences (NIH P30 ES005605, NIH Z01 ES025041)
Centers for Disease Control and Prevention (CDC/NCHS (200-2010-34238 NCE1)
Received: 8 October 2019
Accepted: 28 February 2020
First Online: 16 March 2020
Ethics approval and consent to participate
: The Institutional Review Boards of the Centers for Disease Control and Prevention (CDC) and the National Center for Health Statistics (NCHS) approved the NHANES protocols and informed consent was obtained from all participants. Details of the IRB approval are available at http://www.cdc.gov/nchs/nhanes/irba98.html.
: All authors approved the manuscript and this submission.
: The authors have no actual or potential competing financial interests.