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.
Friedrich CA, Rader DJ.Friedrich CA, et al. Among authors: rader dj.Rheum Dis Clin North Am. 1999 Aug;25(3):507-20. doi: 10.1016/s0889-857x(05)70084-3.Rheum Dis Clin North Am. 1999.PMID: 10467626Free article.Review.