GFAP and amyotrophic lateral sclerosis: The GFAP levels correlated with ALS-specific subscores of Edinburgh Cognitive and Behavioral ALS Screen (ECAS) (Rho = −0.22, p = 0.04), Brief Mental Deterioration Battery (BMDB) total score (Rho = −0.23, p = 0.019), Category Fluency scores (Rho = −0.20, p = 0.036), and Freehand copy of drawings (Rho = −0.26, p = 0.01).