<style face="normal" font="default" size="100%">Metformin and the risk of head and neck cancer: a case-control analysis</style>

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31<style face="normal" font="default" size="100%">Metformin and the risk of head and neck cancer: a case-control analysis</style><style face="normal" font="default" size="100%">Metformin and the risk of head and neck cancer: a case-control analysis</style>