<style face="normal" font="default" size="100%">Validity of smoking prevalence estimates from primary care electronic health records compared with national population survey data for England, 2007 to 2011</style>

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31<style face="normal" font="default" size="100%">Validity of smoking prevalence estimates from primary care electronic health records compared with national population survey data for England, 2007 to 2011</style><style face="normal" font="default" size="100%">Validity of smoking prevalence estimates from primary care electronic health records compared with national population survey data for England, 2007 to 2011</style>