<style face="normal" font="default" size="100%">Extreme restriction design as a method for reducing confounding by indication in pharmacoepidemiologic research</style>

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31<style face="normal" font="default" size="100%">Extreme restriction design as a method for reducing confounding by indication in pharmacoepidemiologic research</style><style face="normal" font="default" size="100%">Extreme restriction design as a method for reducing confounding by indication in pharmacoepidemiologic research</style>