<style face="normal" font="default" size="100%">COPD disease severity and the risk of venous thromboembolic events: a matched case-control study</style>

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31<style face="normal" font="default" size="100%">COPD disease severity and the risk of venous thromboembolic events: a matched case-control study</style><style face="normal" font="default" size="100%">COPD disease severity and the risk of venous thromboembolic events: a matched case-control study</style>