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.
Sharmer L, Northrup-Snyder K, Juan W.Sharmer L, et al. Among authors: northrup snyder k.J Environ Health. 2007 Oct;70(3):15-9, 48; quiz 51-2.J Environ Health. 2007.PMID: 17941398