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.
Demmer RT, Papapanou PN, Jacobs DR Jr, Desvarieux M.Demmer RT, et al.BMC Med Res Methodol. 2010 Jan 7;10:2. doi: 10.1186/1471-2288-10-2.BMC Med Res Methodol. 2010.PMID: 20056008Free PMC article.