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.
Soza A, López-Lastra M.Soza A, et al.Rev Med Chil. 2006 Jun;134(6):777-88. doi: 10.4067/s0034-98872006000600016. Epub 2006 Aug 14.Rev Med Chil. 2006.PMID: 17130955Free article.Review.Spanish.