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.
Hillemeier MM, Weisman CS, Chase GA, Dyer AM.Hillemeier MM, et al. Among authors: chase ga.Am J Public Health. 2008 Jul;98(7):1271-9. doi: 10.2105/AJPH.2006.107771. Epub 2008 May 29.Am J Public Health. 2008.PMID: 18511738Free PMC article.