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.
Dulfer SE, Lange F, Wapstra FH, Potgieser ARE, Valk JP, Absalom AR, Groen RJM, Faber C, Drost G.Dulfer SE, et al. Among authors: valk jp.Eur Spine J. 2020 Aug;29(8):2029-2035. doi: 10.1007/s00586-020-06458-9. Epub 2020 May 21.Eur Spine J. 2020.PMID: 32440770
van der Knaap MS, Barth PG, Stroink H, van Nieuwenhuizen O, Arts WF, Hoogenraad F, Valk J.van der Knaap MS, et al.Ann Neurol. 1995 Mar;37(3):324-34. doi: 10.1002/ana.410370308.Ann Neurol. 1995.PMID: 7695231
van der Knaap MS, Bakker HD, Valk J.van der Knaap MS, et al.AJNR Am J Neuroradiol. 1998 Feb;19(2):378-82.AJNR Am J Neuroradiol. 1998.PMID: 9504498Free PMC article.
van der Knaap MS, Kamphorst W, Barth PG, Kraaijeveld CL, Gut E, Valk J.van der Knaap MS, et al.Neurology. 1998 Aug;51(2):540-7. doi: 10.1212/wnl.51.2.540.Neurology. 1998.PMID: 9710032Clinical Trial.