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.
Swietach P, Vaughan-Jones RD.Swietach P, et al.Ann N Y Acad Sci. 2005 Jun;1047:271-82. doi: 10.1196/annals.1341.024.Ann N Y Acad Sci. 2005.PMID: 16093503