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.
Katz WF, Curtiss S, Tallal P.Katz WF, et al.Ann N Y Acad Sci. 1993 Jun 14;682:359-62. doi: 10.1111/j.1749-6632.1993.tb22994.x.Ann N Y Acad Sci. 1993.PMID: 8323136No abstract available.