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The changes in the final trial scores on the Standard Verbal Paired Associated Learning (S-PA) test for unrelated words before preconditioning and at 70 days after transplantation. Higher-level reactivation was defined as reactivation of HHV-6 DNA ≥ 16,134 copies/mL (the median value of the maximum plasma HHV-6 load in participating patients). aPaired t-test
