<style face="normal" font="default" size="100%">Effect of weather on back pain: results from a case-crossover study</style>

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0<style face="normal" font="default" size="100%">Effect of weather on back pain: results from a case-crossover study</style><style face="normal" font="default" size="100%">Effect of weather on back pain: results from a case-crossover study</style>