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JAMA Internal Medicine

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The Number Needed to Be Exposed: A Potential Use for Quantifying the Strength of an Individual Risk Factor Including a Protective Factor in a Cohort Study—Reply
Cerhan JR, Bardia A, Vierkant RA, Vachon CM.
Arch Intern Med. 2007;167(15):1690-1691.
Published online August 13, 2007

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