<style face="normal" font="default" size="100%">Genetics and the environment affect the relationship between depression and low back pain: a co-twin control study of Spanish twins</style>

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0<style face="normal" font="default" size="100%">Genetics and the environment affect the relationship between depression and low back pain: a co-twin control study of Spanish twins</style><style face="normal" font="default" size="100%">Genetics and the environment affect the relationship between depression and low back pain: a co-twin control study of Spanish twins</style>