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.
Dorsett M, Liang SY.Dorsett M, et al. Among authors: liang sy.Emerg Med Clin North Am. 2016 Nov;34(4):917-942. doi: 10.1016/j.emc.2016.06.013.Emerg Med Clin North Am. 2016.PMID: 27741995Free PMC article.Review.