Meoded A, Kwan JY, Peters TL, Huey ED, Danielian LE, Wiggs E, Morrissette A, Wu T, Russell JW, Bayat E, Grafman J, Floeter MK. Imaging findings associated with cognitive performance in primary lateral sclerosis and amyotrophic lateral sclerosis. Dement Geriatr Cogn Dis Extra. 2013; 3(1):233-50.