The effect of IFN beta-1b on the evolution of enhancing lesions in secondary progressive

Brex, Pa; Molyneux, Pd; Smiddy, P; Barkhof, F; Filippi, Massimo; Yousry, Ta; Hahn, D; Rolland, Y; Salonen, O; Pozzilli, C; Polman, Ch; Thompson, Aj; Kappos, L; Miller, Dh