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.
Angulo JC, López JI, Unda-Urzaiz M, Flores N.Angulo JC, et al. Among authors: lopez ji.Postgrad Med J. 1992 Feb;68(796):150-1. doi: 10.1136/pgmj.68.796.150-a.Postgrad Med J. 1992.PMID: 1570262Free PMC article.No abstract available.