Cortical Lesions in Primary Progressive Multiple Sclerosis: A 2-Year Longitudinal MR Study
Neurol 72:1330-1336, Calabrese,M.,et al, 2009
Chronic Progressive Multiple Sclerosis:Serial Magnetic Resonance Brain Imaging Over Six Months
Ann Neurol 26:248-256, Koopmans,R.A.,et al, 1989