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.
Didier A, Têtu L.Didier A, et al. Among authors: tetu l.Rev Prat. 2005 Jun 30;55(12):1327-8, 1330-3, 1335-6 passim.Rev Prat. 2005.PMID: 16138600French.