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.
Shah AJ, Parsons B, Pope I, Callaway M, Finch-Jones MD, Thomas MG.Shah AJ, et al.Clin Imaging. 2009 May-Jun;33(3):209-12. doi: 10.1016/j.clinimag.2008.09.015.Clin Imaging. 2009.PMID: 19411027