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.
Hetts SW, English JD.Hetts SW, et al. Among authors: english jd.Neuroimaging Clin N Am. 2010 Nov;20(4):493-510. doi: 10.1016/j.nic.2010.07.009.Neuroimaging Clin N Am. 2010.PMID: 20974373Review.