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.
Davidson IM.Davidson IM.Br Med J. 1941 Nov 22;2(4220):725-6. doi: 10.1136/bmj.2.4220.725.Br Med J. 1941.PMID: 20783972Free PMC article.No abstract available.