Cerebral circulation time is prolonged and not correlated with EDSS in multiple sclerosis patients: a study using digital subtracted angiography. - Monti L; Donati D; Menci E; Cioni S; Bellini M; Grazzini I; Leonini S; Galluzzi P; Bracco S; Severi S; Burroni L; Casasco A; et al. (PloS one, 2015)