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. 2021 Mar 15;268(9):3444–3455. doi: 10.1007/s00415-021-10519-4

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© The Author(s) 2021

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Fig. 2 — A 3-D scatterplot showing the regression of MoCA (Z score) minus PD-CFRS (Z score) on Beck Depression Inventory and Fatigue Severity Scale; the tinted trapezium (regression plane) is built by linear multiple regression equation and the dots represent the observed data points; the color bar represents the values of beta coefficients