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.
Haugen AJ, Grøvle L, Keller A, Grotle M.Haugen AJ, et al.Spine (Phila Pa 1976). 2008 Aug 1;33(17):E595-601. doi: 10.1097/BRS.0b013e31817c6c4b.Spine (Phila Pa 1976). 2008.PMID: 18670327
Grøvle L, Haugen AJ, Keller A, Natvig B, Brox JI, Grotle M.Grøvle L, et al. Among authors: haugen aj.Spine (Phila Pa 1976). 2008 Oct 1;33(21):2347-53. doi: 10.1097/BRS.0b013e31818047d6.Spine (Phila Pa 1976). 2008.PMID: 18827701
Grøvle L, Haugen AJ, Keller A, Natvig B, Brox JI, Grotle M.Grøvle L, et al. Among authors: haugen aj.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.