Characterizing the mechanisms of progression in multiple sclerosis. Evidence and new hypotheses for future directions.

Frohman, Em; Filippi, Massimo; Stuve, O; Waxman, Sg; Corboy, J; Phillips, Jt; Lucchinetti, C; Wilken, J; Karandikar, N; Hemmer, B; Monson, N; Dekeyser, J; Hartung, H; Steinman, L; Oksenberg, Jr; Cree, Bac; Hauser, S; Racke, Mk