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.
García-Juárez G, Ramírez-Bribiesca JE, Hernández-Vázquez M, Hernández-Calva LM, Díaz-Aparicio E, Orozco-Bolaños H.García-Juárez G, et al.Salud Publica Mex. 2014 Jul-Aug;56(4):355-62.Salud Publica Mex. 2014.PMID: 25604175Spanish.