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.
Matchar DB, Keefe FJ, McCrory DC, Scipio CD, Cooper K, Kolimaga JT, Huntington AC.Matchar DB, et al.Rockville (MD): Agency for Healthcare Research and Quality (US); 2004 Feb 9.Rockville (MD): Agency for Healthcare Research and Quality (US); 2004 Feb 9.PMID: 25855838Free Books & Documents.Review.