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.
Andersson TM, Dickman PW, Eloranta S, Lambert PC.Andersson TM, et al. Among authors: lambert pc.BMC Med Res Methodol. 2011 Jun 22;11:96. doi: 10.1186/1471-2288-11-96.BMC Med Res Methodol. 2011.PMID: 21696598Free PMC article.