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.
Booth CM, Li G, Zhang-Salomons J, Mackillop WJ.Booth CM, et al. Among authors: zhang salomons j.Cancer. 2010 Sep 1;116(17):4160-7. doi: 10.1002/cncr.25427.Cancer. 2010.PMID: 20681012Free article.