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.
Poston L, Raijmakers M, Kelly F.Poston L, et al.Ann N Y Acad Sci. 2004 Dec;1031:242-8. doi: 10.1196/annals.1331.024.Ann N Y Acad Sci. 2004.PMID: 15753150Review.