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.
López-Torres L, Chiappe M, Cárcamo C, Garnett G, Holmes K, García P.López-Torres L, et al.Rev Peru Med Exp Salud Publica. 2016 Jul-Sep;33(3):448-454. doi: 10.17843/rpmesp.2016.333.2350.Rev Peru Med Exp Salud Publica. 2016.PMID: 27831607Free article.Spanish.