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.
Barcellos C, Sabroza PC.Barcellos C, et al.Int J Environ Health Res. 2000 Dec;10(4):301-13. doi: 10.1080/0960312002001500.Int J Environ Health Res. 2000.PMID: 11260779