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.
Koyfman SA, Agrawal M, Garrett-Mayer E, Krohmal B, Wolf E, Emanuel EJ, Gross CP.Koyfman SA, et al.Cancer. 2007 Sep 1;110(5):1115-24. doi: 10.1002/cncr.22878.Cancer. 2007.PMID: 17628485Free article.Review.