 Additionally, several test and scales were administered. The Expanded Disability Status Scale was used for rating the degree of neurologic impairment. Premorbid IQ was tested by The Accentuation Reading Test. Cognitive reserve was estimated with the Cognitive Reserve Questionnaire. The 15-item Geriatric Depression Scale was included to assess patients depressive symptoms. The Fatigue Severity Scale and the mental fatigue Visual Analogue Scale were included to evaluate physical and mental fatigue, respectively. 