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.
Chubineh S, Birk J.Chubineh S, et al. Among authors: birk j.South Med J. 2012 Nov;105(11):613-8. doi: 10.1097/SMJ.0b013e31826efbea.South Med J. 2012.PMID: 23128806Review.