<style face="normal" font="default" size="100%">Usefulness of perceived level of exertion in patients with chronic low back pain attending a physical training programme</style>

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0<style face="normal" font="default" size="100%">Usefulness of perceived level of exertion in patients with chronic low back pain attending a physical training programme</style><style face="normal" font="default" size="100%">Usefulness of perceived level of exertion in patients with chronic low back pain attending a physical training programme</style>