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.
Malta DC, Moura EC, Silva SA, Oliveira PP, Silva VL.Malta DC, et al.J Bras Pneumol. 2010 Jan-Feb;36(1):75-83. doi: 10.1590/s1806-37132010000100013.J Bras Pneumol. 2010.PMID: 20209311Free article.English, Portuguese.
Malta DC, Machado IE, Porto DL, da Silva MM, de Freitas PC, da Costa AW, Oliveira-Campos M.Malta DC, et al.Rev Bras Epidemiol. 2014;17 Suppl 1:203-14. doi: 10.1590/1809-4503201400050016.Rev Bras Epidemiol. 2014.PMID: 25054264Free article.English, Portuguese.