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.
Li Y, Fairman RT, Churchill V, Ashley DL, Popova L.Li Y, et al. Among authors: ashley dl.Int J Environ Res Public Health. 2020 Feb 2;17(3):918. doi: 10.3390/ijerph17030918.Int J Environ Res Public Health. 2020.PMID: 32024230Free PMC article.