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.
Reis J, Amarante J, Malheiro E, Santa-Comba A, Costa-Ferreira A, Barroso ML.Reis J, et al. Among authors: barroso ml.Acta Med Port. 1998 Feb;11(2):103-10.Acta Med Port. 1998.PMID: 9567406Free article.Portuguese.