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.
Wang HE, Devereaux RS, Yealy DM, Safford MM, Howard G.Wang HE, et al. Among authors: devereaux rs.Int J Health Geogr. 2010 Feb 15;9:9. doi: 10.1186/1476-072X-9-9.Int J Health Geogr. 2010.PMID: 20156361Free PMC article.