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.
Prietsch SO, González-Chica DA, Cesar JA, Mendoza-Sassi RA.Prietsch SO, et al.Cad Saude Publica. 2011 Oct;27(10):1906-16. doi: 10.1590/s0102-311x2011001000004.Cad Saude Publica. 2011.PMID: 22031195Free article.Portuguese.