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.
van Middelkoop M, Rubinstein SM, Kuijpers T, Verhagen AP, Ostelo R, Koes BW, van Tulder MW.van Middelkoop M, et al. Among authors: verhagen ap.Eur Spine J. 2011 Jan;20(1):19-39. doi: 10.1007/s00586-010-1518-3. Epub 2010 Jul 18.Eur Spine J. 2011.PMID: 20640863Free PMC article.Review.
Lievense A, Bierma-Zeinstra S, Verhagen A, Verhaar J, Koes B.Lievense A, et al.J Rheumatol. 2001 Nov;28(11):2520-8.J Rheumatol. 2001.PMID: 11708427Review.