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PII: S1529-9430(09)00213-7
doi:10.1016/j.spinee.2009.05.001
© 2009 Elsevier Inc. All rights reserved.
PII: S1529-9430(09)00213-7
doi:10.1016/j.spinee.2009.05.001
© 2009 Elsevier Inc. All rights reserved.