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.
Bindawas SM, Vennu V.Bindawas SM, et al.Int J Environ Res Public Health. 2015 Feb 5;12(2):1849-63. doi: 10.3390/ijerph120201849.Int J Environ Res Public Health. 2015.PMID: 25664695Free PMC article.