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Relationship between the relative difference between open and closed eyes of sway area of center of pressure and hippocampal volume. The thick line is the best-fit linear regression line, and the thin lines at the top and bottom are the limits of the 95 % confidence interval. *calculated from the formula (eyes open – eyes closed / (eyes open + eyes closed) / 2) × 100. †sum of the total area of anterior-posterior and medial-lateral displacements
