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.
Delaney-Black V, Covington C, Templin T, Ager J, Martier S, Compton S, Sokol R.Delaney-Black V, et al.Ann N Y Acad Sci. 1998 Jun 21;846:277-88.Ann N Y Acad Sci. 1998.PMID: 9668414