Neutralizing antibodies during treatment of multiple sclerosis with interferon beta-1b: Experience during the first three years by Duquette, P, Girard, M, Dubois, R, Kobler, R, Lublin, F, Kelley, L, Francis, G, Freedman, M, Greenstein, J, Mishra, B, DeLillio, N, Whitaker, J, Layton, B, Sibley, W, Laguna, J, Krikawa, J, Paty, D, Oger, J, Kastrukoff, L, Morrison, W, Nelson, J, Goodin, D, Massa, S, Gutteridge, E, Arnason, B