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.
Smith A, Emerson D, Winkelmann Z, Potter D, Torres-McGehee T.Smith A, et al.Int J Environ Res Public Health. 2020 Nov 4;17(21):8137. doi: 10.3390/ijerph17218137.Int J Environ Res Public Health. 2020.PMID: 33158069Free PMC article.