<style face="normal" font="default" size="100%">What triggers an episode of low back pain? Results of a case-crossover study</style>

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3<style face="normal" font="default" size="100%">What triggers an episode of low back pain? Results of a case-crossover study</style><style face="normal" font="default" size="100%">What triggers an episode of low back pain? Results of a case-crossover study</style>