Article History
Received: 20 May 2019
Accepted: 4 October 2019
First Online: 23 October 2019
Compliance with ethical standards
:
: We declare that we have no competing interests.
: The National Center for Health Statistics (NCHS) Research Ethics Review Board approved the NHANES protocol.
: All procedures performed in the study were in accodance with recommendations of the International Council for Harmonisation (ICH) Good Clinical Practice (GCP) standards (ICH-GCP) and the Declaration of Helsinki.
: Informed consent was obtained from all individual participants included in the study.