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Distribution of a superficial vessel density, b deep vessel density, c superficial fractal dimension, and d deep fractal dimension stratified by participants having with Alzheimer’s disease (AD), mild cognitive impairment (MCI), and controls. Data and P values shown are after adjustment for age, gender, race, diabetes, and blood pressure (systolic and diastolic levels). The asterisk symbol (*) indicates a statistical significance of P < 0.05 when compared to the controls
