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.
Isaacson J, Provenzale J.Isaacson J, et al.Neuroimaging Clin N Am. 2011 Feb;21(1):179-89, ix. doi: 10.1016/j.nic.2011.02.005.Neuroimaging Clin N Am. 2011.PMID: 21477757Review.