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.
Moreno-Tamayo K, González de Cossío T, Flores-Aldana M, Rodríguez-Ramírez S, Ortiz-Hernández L.Moreno-Tamayo K, et al.Salud Publica Mex. 2011 Jul-Aug;53(4):299-311. doi: 10.1590/s0036-36342011000400004.Salud Publica Mex. 2011.PMID: 21986786