Cognitive impairment and magnetic resonance imaging correlates in primary progressive multiple sclerosis.

Gouveia A, Dias SP, Santos T, Rocha H, Coelho CR, Ruano L, Galego O, Diogo MC, Seixas D, Sá MJ, et al.

Acta Neurol Scand. 2017 Aug; 136(2):109-115. PMID: 27778334. Abstract