Funding for this research was provided by:
National Institutes of Health (UG3/UH3OD023305, 4P30ES000260-52)
Received: 1 April 2020
Accepted: 12 August 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: Subjects provided the written informed consent, and the institutional review board of the National Center for Health Statistics approved the survey for NHANES study.
: Not applicable.
: The authors declare that they have no competing interests.