<style face="normal" font="default" size="100%">Persistent postoperative pain and healthcare costs associated with instrumented and non-instrumented spinal surgery: a case-control study</style>

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31<style face="normal" font="default" size="100%">Persistent postoperative pain and healthcare costs associated with instrumented and non-instrumented spinal surgery: a case-control study</style><style face="normal" font="default" size="100%">Persistent postoperative pain and healthcare costs associated with instrumented and non-instrumented spinal surgery: a case-control study</style>