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.
Tracy M, Hobfoll SE, Canetti-Nisim D, Galea S.Tracy M, et al. Among authors: canetti nisim d.Ann Epidemiol. 2008 Jun;18(6):447-57. doi: 10.1016/j.annepidem.2007.12.004. Epub 2008 Feb 8.Ann Epidemiol. 2008.PMID: 18261923Free PMC article.