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.
Grøvle L, Haugen AJ, Keller A, Natvig B, Brox JI, Grotle M.Grøvle L, et al. Among authors: keller a.Eur Spine J. 2010 Feb;19(2):263-9. doi: 10.1007/s00586-009-1042-5. Epub 2009 Jun 2.Eur Spine J. 2010.PMID: 19488793Free PMC article.
Grøvle L, Haugen AJ, Keller A, Natvig B, Brox JI, Grotle M.Grøvle L, et al. Among authors: keller a.Spine (Phila Pa 1976). 2008 Oct 1;33(21):2347-53. doi: 10.1097/BRS.0b013e31818047d6.Spine (Phila Pa 1976). 2008.PMID: 18827701
Haugen AJ, Grøvle L, Keller A, Grotle M.Haugen AJ, et al. Among authors: keller a.Spine (Phila Pa 1976). 2008 Aug 1;33(17):E595-601. doi: 10.1097/BRS.0b013e31817c6c4b.Spine (Phila Pa 1976). 2008.PMID: 18670327
Keller A, Johansen JG, Hellesnes J, Brox JI.Keller A, et al.Spine (Phila Pa 1976). 1999 Feb 1;24(3):275-80. doi: 10.1097/00007632-199902010-00016.Spine (Phila Pa 1976). 1999.PMID: 10025023