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.
Vickers AJ.Vickers AJ.BMC Med Res Methodol. 2001;1:6. doi: 10.1186/1471-2288-1-6. Epub 2001 Jun 28.BMC Med Res Methodol. 2001.PMID: 11459516Free PMC article.
Vickers A, Wilson P, Kleijnen J.Vickers A, et al.Qual Saf Health Care. 2002 Mar;11(1):92-7. doi: 10.1136/qhc.11.1.92.Qual Saf Health Care. 2002.PMID: 12078381Free PMC article.Review.No abstract available.