<style face="normal" font="default" size="100%">Immortal time bias for life-long conditions in retrospective observational studies using electronic health records</style>

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0<style face="normal" font="default" size="100%">Immortal time bias for life-long conditions in retrospective observational studies using electronic health records</style><style face="normal" font="default" size="100%">Immortal time bias for life-long conditions in retrospective observational studies using electronic health records</style>