Switching multiple sclerosis patients with breakthrough disease to second-line therapy.

Castillo-Trivino T, Mowry EM, Gajofatto A, Chabas D, Crabtree-Hartman E, Cree BA, Goodin DS, Green AJ, Okuda DT, Pelletier D, Zamvil SS, Vittinghoff E, Waubant E