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USE OF NESTED CASE-CROSSOVER STUDY WITHIN A PROSPECTIVE COHORT STUDY TO EXAMINE BOTH FIXED AND TRANSIENT RISK FACTORS FOR SLIPPING
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Verma S, Chang W, Lombardi D, et al
USE OF NESTED CASE-CROSSOVER STUDY WITHIN A PROSPECTIVE COHORT STUDY TO EXAMINE BOTH FIXED AND TRANSIENT RISK FACTORS FOR SLIPPING