<style face="normal" font="default" size="100%">Long-term efficacy and safety of varenicline for smoking cessation: a systematic review and meta-analysis of randomized controlled trials</style>

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0<style face="normal" font="default" size="100%">Long-term efficacy and safety of varenicline for smoking cessation: a systematic review and meta-analysis of randomized controlled trials</style><style face="normal" font="default" size="100%">Long-term efficacy and safety of varenicline for smoking cessation: a systematic review and meta-analysis of randomized controlled trials</style>