Efficacy and Safety of Alemtuzumab in Patients With Relapsing-Remitting Multiple Sclerosis Who Relapsed on Prior Therapy: Four-Year Follow-Up of the Care-Ms II Study

B. C. Kieseier, M. A. Sahraian, A. J. Coles, H. P. Hartung, E. Havrdova, K. W. Selmaj, D. H. Margolin, J. Palmer, P. Oyuela, USA