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.
Gorlin RJ, Anderson VE, Scott CR.Gorlin RJ, et al.N Engl J Med. 1961 Mar 9;264:486-9. doi: 10.1056/NEJM196103092641004.N Engl J Med. 1961.PMID: 13707262No abstract available.