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Distribution of the activation error of the PM and CM at the four stimulation sites for variations in electrode size (1.00 cm2, 9.00 cm2, and 25 cm2), interelectrode distance (2 cm, 4 cm, and 6 cm), and fiber thickness of the targeted nerve (8 μm, 12 μm, and 16 μm). *P < 0.01 and **P < 0.001 (two-way ANOVA followed by Bonferroni post hoc test, n = 4 per group).
