<style face="normal" font="default" size="100%">Effect of length of follow-up on relative risk in longitudinal data. Contributed paper session</style>

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31<style face="normal" font="default" size="100%">Effect of length of follow-up on relative risk in longitudinal data. Contributed paper session</style><style face="normal" font="default" size="100%">Effect of length of follow-up on relative risk in longitudinal data. Contributed paper session</style>