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.
Cronin PA, Wang JH, Redmond HP.Cronin PA, et al. Among authors: wang jh.BMC Cancer. 2010 May 21;10:225. doi: 10.1186/1471-2407-10-225.BMC Cancer. 2010.PMID: 20492653Free PMC article.