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.
Paula Fde L, da Cunha GM, Leite Ida C, Pinheiro RS, Valente JG.Paula Fde L, et al. Among authors: valente jg.Rev Bras Epidemiol. 2015 Apr-Jun;18(2):439-53. doi: 10.1590/1980-5497201500020012.Rev Bras Epidemiol. 2015.PMID: 26083514Free article.English, Portuguese.