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PMC full text:

Eur Spine J. 2011 Feb; 20(2): 274–279.

Published online 2010 Dec 17. doi: 10.1007/s00586-010-1657-6

Copyright/License ►Request permission to reuse: Copyright © Springer-Verlag 2010

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Fig. 1

Details of Question 1 in the questionnaire