Havla, J., Gerdes, L. A., Meinl, I., Krumbholz, M., Faber, H., Weber, F., Pellkofer, H. L., Hohlfeld, R., & Kümpfel, T. (2011). De-escalation from natalizumab in multiple sclerosis: recurrence of disease activity despite switching to glatiramer acetate. Journal of Neurology, 258(9), 1665-1669.