AQP4 and Charcot-Marie-Tooth disease type 3: Serum GFAP levels in the AQP4-ON group were significantly higher than those of the MOG-ON and DSN-ON groups (AQP4-ON, 269.1 [111.7–342.1] vs. MOG-ON, 62.5 [48.8–95.7] vs. DSN-ON, 77.6 [61.0–109.9] pg/mL, p < 0.001).