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.
Thrasher JF, Swayampakala K, Arillo-Santillán E, Sebrié E, Walsemann KM, Bottai M.Thrasher JF, et al. Among authors: swayampakala k.Salud Publica Mex. 2010;52 Suppl 2(0 2):S244-53. doi: 10.1590/s0036-36342010000800020.Salud Publica Mex. 2010.PMID: 21243195Free PMC article.