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.
Gomez-Vargas A, Baker SK.Gomez-Vargas A, et al. Among authors: baker sk.Rheum Dis Clin North Am. 2011 May;37(2):269-87, vii. doi: 10.1016/j.rdc.2011.01.009.Rheum Dis Clin North Am. 2011.PMID: 21444025Review.