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.
Giammarco R, Goldstein MB, Halperin ML, Stinebaugh BJ.Giammarco R, et al. Among authors: stinebaugh bj.Can Med Assoc J. 1975 Feb 22;112(4):463-6.Can Med Assoc J. 1975.PMID: 234290Free PMC article.