Regional cortical thinning in multiple sclerosis and its relation with cognitive impairment: A multicenter study

J. M. Tillema, H. E. Hulst, M. A. Rocca, H. Vrenken, M. D. Steenwijk, D. Damjanovic, C. Enzinger, S. Ropele, G. Tedeschi, A. Gallo, O. Ciccarelli, A. Rovira, X. Montalban, N. De Stefano, M. L. Stromillo, M. Filippi, F. Barkhof