Modeling of cognitive impairment by disease duration in multiple sclerosis: a cross-sectional study.
BACKGROUND/AIMS: Large-scale population studies measuring rates and dynamics of cognitive decline in multiple sclerosis (MS) are lacking.In the current cross-sectional study we evaluated the patterns of cognitive impairment in MS patients with disease duration of up to 30 years.METHODS: 1,500 patients with MS were assessed by a computerized cogniti