7T quantitative magnetization transfer (qMT) of cortical gray matter in multiple sclerosis correlates with cognitive impairment. - McKeithan LJ; Lyttle BD; Box BA; O'Grady KP; Dortch RD; Conrad BN; Thompson LM; Rogers BP; Newhouse P; Pawate S; Bagnato F; Smith SA (NeuroImage, 2019)