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.
González-Alvarez ME, Aboal-Somoza M, Bermejo-Barrera P.González-Alvarez ME, et al.Water Environ Res. 2012 Feb;84(2):150-4. doi: 10.2175/106143011x13203533157316.Water Environ Res. 2012.PMID: 22515065