<style face="normal" font="default" size="100%">Design choices for observational studies of the effect of exposure on disease incidence</style>

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0<style face="normal" font="default" size="100%">Design choices for observational studies of the effect of exposure on disease incidence</style><style face="normal" font="default" size="100%">Design choices for observational studies of the effect of exposure on disease incidence</style>