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.
Platt H.Platt H.Br Med J. 1921 Apr 23;1(3147):596-600. doi: 10.1136/bmj.1.3147.596.Br Med J. 1921.PMID: 20770270Free PMC article.No abstract available.