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.
Davis JC, Marra CA, Robertson MC, Najafzadeh M, Liu-Ambrose T.Davis JC, et al. Among authors: marra ca.J Am Geriatr Soc. 2011 Jul;59(7):1232-7. doi: 10.1111/j.1532-5415.2011.03474.x. Epub 2011 Jun 30.J Am Geriatr Soc. 2011.PMID: 21718265Free PMC article.Clinical Trial.