Erratum to: Eur Spine J DOI 10.1007/s00586-006-0252-3
Discussion section: At the end of the first paragraph, Refs. [19, 21] were omitted.
Conclusion section: “9-month period” should read “6-month period”.
Footnotes
The online version of this article can be found at http://dx.doi.org/10.1007/s00586-006-0252-3.