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.
Choi JI, Svensson CI, Koehrn FJ, Bhuskute A, Sorkin LS.Choi JI, et al. Among authors: sorkin ls.Pain. 2010 May;149(2):243-253. doi: 10.1016/j.pain.2010.02.008. Epub 2010 Mar 3.Pain. 2010.PMID: 20202754Free PMC article.
Schäfers M, Sorkin LS, Sommer C.Schäfers M, et al. Among authors: sorkin ls.Pain. 2003 Aug;104(3):579-588. doi: 10.1016/S0304-3959(03)00115-5.Pain. 2003.PMID: 12927630