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.
Castillo-Álvarez F, Hernando de la Bárcena I, Marzo-Sola ME.Castillo-Álvarez F, et al.Med Clin (Barc). 2017 Jan 6;148(1):28-32. doi: 10.1016/j.medcli.2016.07.032. Epub 2016 Oct 12.Med Clin (Barc). 2017.PMID: 27743594Review.English, Spanish.