Neuropsychological impairment correlates with hypoperfusion and hypometabolism but not with severity of white matter lesions on MRI in patients with cerebral microangiopathy - Sabri, O; Ringelstein, EB; Hellwig, D; Schneider, R; Schreckenberger, M; Kaiser, HJ; Mull, M; Buell, U (Stroke, 1999)