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.
Schneider M, Fehring RJ.Schneider M, et al. Among authors: fehring rj.Linacre Q. 2012 Nov;79(4):460-473. doi: 10.1179/002436312804827064. Epub 2012 Nov 1.Linacre Q. 2012.PMID: 30082989Free PMC article.