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.
Zhang Y, Lave JR, Newhouse JP, Donohue JM.Zhang Y, et al. Among authors: donohue jm.J Gerontol B Psychol Sci Soc Sci. 2010 Jul;65(4):502-7. doi: 10.1093/geronb/gbp111. Epub 2009 Dec 14.J Gerontol B Psychol Sci Soc Sci. 2010.PMID: 20008482Free PMC article.