<style face="normal" font="default" size="100%">Imperfect placebos are common in low back pain trials. A systematic review of the literature</style>

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0<style face="normal" font="default" size="100%">Imperfect placebos are common in low back pain trials. A systematic review of the literature</style><style face="normal" font="default" size="100%">Imperfect placebos are common in low back pain trials. A systematic review of the literature</style>