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. 2014 Jun 19;10:24. doi: 10.1186/1746-160X-10-24

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Copyright © 2014 Li et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Relationship of von Mises stress and the opening distance. Von Mises stress in the superior (S), middle (M) and inferior (I) disc layers is plotted against the opening distance.