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.
Soares PM, Cabello C, Magna LA, Tinois E, Benetti-Pinto CL.Soares PM, et al.Sao Paulo Med J. 2010 Jul;128(4):211-4. doi: 10.1590/s1516-31802010000400007.Sao Paulo Med J. 2010.PMID: 21120432Free PMC article.