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.
Cala-Pérez L, Losa-Iglesias ME, Rodríguez-Sanz D, Calvo-Lobo C, López-López D, Becerro-de-Bengoa-Vallejo R.Cala-Pérez L, et al.Sao Paulo Med J. 2018 Nov-Dec;136(6):505-510. doi: 10.1590/1516-3180.2018.0202161118.Sao Paulo Med J. 2018.PMID: 30892480Free PMC article.