An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Williams BA.Williams BA.Int J Environ Res Public Health. 2021 Dec 14;18(24):13193. doi: 10.3390/ijerph182413193.Int J Environ Res Public Health. 2021.PMID: 34948800Free PMC article.
Williams BA, Agarwal S.Williams BA, et al.Circ J. 2018 Feb 23;82(3):724-731. doi: 10.1253/circj.CJ-17-0670. Epub 2018 Jan 18.Circ J. 2018.PMID: 29343672Free article.