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.
Allen B Jr, Levin DC, Brant-Zawadzki M, Lexa FJ, Duszak R Jr.Allen B Jr, et al. Among authors: levin dc.J Am Coll Radiol. 2011 May;8(5):309-17. doi: 10.1016/j.jacr.2011.02.011.J Am Coll Radiol. 2011.PMID: 21531306Review.