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?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a formula to zoom. Abstract In large sample sizes or long-term survival data studies, the case-cohort sampling design involves randomly selecting a subcohort from the entire cohort and all the failed subjects outside the subcohort.
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