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Kaplan-Meier plots of the estimated probability of aMCI patients remaining stable as a function of follow-up time. The plots represent aMCI patients with hippocampal ADC ≤ 888 × 10−6 mm2/s (median hippocampal ADC among aMCIs), and aMCI patients with hippocampal ADC >888 × 10−6 mm2/s.