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.
Bjerregaard P.Bjerregaard P.Sci Total Environ. 1995 Jan 15;160-161:521-7. doi: 10.1016/0048-9697(95)04386-f.Sci Total Environ. 1995.PMID: 7892582Review.