<style face="normal" font="default" size="100%">Interpreting studies of predictor variables and clinical outcomes: what does having a risk factor really mean?</style>

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31<style face="normal" font="default" size="100%">Interpreting studies of predictor variables and clinical outcomes: what does having a risk factor really mean?</style><style face="normal" font="default" size="100%">Interpreting studies of predictor variables and clinical outcomes: what does having a risk factor really mean?</style>