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.
Rolfe LM, Rayner CF.Rolfe LM, et al. Among authors: rayner cf.Postgrad Med J. 1999 Aug;75(886):503-4. doi: 10.1136/pgmj.75.886.503.Postgrad Med J. 1999.PMID: 10646039Free PMC article.No abstract available.