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.
Sollmann N, Ille S, Obermueller T, Negwer C, Ringel F, Meyer B, Krieg SM.Sollmann N, et al. Among authors: ringel f.Eur J Med Res. 2015 Sep 2;20(1):71. doi: 10.1186/s40001-015-0155-z.Eur J Med Res. 2015.PMID: 26329670Free PMC article.No abstract available.
Stoffel M, Wolf I, Ringel F, Stüer C, Urbach H, Meyer B.Stoffel M, et al. Among authors: ringel f.J Neurosurg Spine. 2007 Apr;6(4):313-9. doi: 10.3171/spi.2007.6.4.5.J Neurosurg Spine. 2007.PMID: 17436919Clinical Trial.
Stoffel M, Behr M, Ringel F, Stuer C, Meyer B.Stoffel M, et al. Among authors: ringel f.Zentralbl Neurochir. 2007 May;68(2):50-8. doi: 10.1055/s-2007-980171.Zentralbl Neurochir. 2007.PMID: 17614084
Stoffel M, Behr M, Reinke A, Stüer C, Ringel F, Meyer B.Stoffel M, et al. Among authors: ringel f.Acta Neurochir (Wien). 2010 May;152(5):835-43. doi: 10.1007/s00701-009-0583-z. Epub 2010 Jan 19.Acta Neurochir (Wien). 2010.PMID: 20084412