<style face="normal" font="default" size="100%">Can analyses of electronic patient records be independently and externally validated? Study 2\textendashthe effect of beta-adrenoceptor blocker therapy on cancer survival: a retrospective cohort study</style>

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31<style face="normal" font="default" size="100%">Can analyses of electronic patient records be independently and externally validated? Study 2\textendashthe effect of beta-adrenoceptor blocker therapy on cancer survival: a retrospective cohort study</style><style face="normal" font="default" size="100%">Can analyses of electronic patient records be independently and externally validated? Study 2\textendashthe effect of beta-adrenoceptor blocker therapy on cancer survival: a retrospective cohort study</style>