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.
Nadel E, Talbot-Stern J.Nadel E, et al.Emerg Med Clin North Am. 1997 May;15(2):389-97. doi: 10.1016/s0733-8627(05)70306-0.Emerg Med Clin North Am. 1997.PMID: 9183280Review.