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PII: S1529-9430(08)00845-0
doi:10.1016/j.spinee.2008.08.003
© 2009 Elsevier Inc. All rights reserved.
PII: S1529-9430(08)00845-0
doi:10.1016/j.spinee.2008.08.003
© 2009 Elsevier Inc. All rights reserved.