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.
Ward WE, Kaludjerovic J, Dinsdale EC.Ward WE, et al.Int J Environ Res Public Health. 2016 May 11;13(5):488. doi: 10.3390/ijerph13050488.Int J Environ Res Public Health. 2016.PMID: 27187422Free PMC article.Review.