<style face="normal" font="default" size="100%">A critical review of methods used to determine the smallest worthwhile effect of interventions for low back pain</style>

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0<style face="normal" font="default" size="100%">A critical review of methods used to determine the smallest worthwhile effect of interventions for low back pain</style><style face="normal" font="default" size="100%">A critical review of methods used to determine the smallest worthwhile effect of interventions for low back pain</style>