| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects and advantages of the present invention will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout, and in which: FIG. 1 is a cross section through the posterior aspect of the lumbar spine; FIG. 2 is a s
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