@article {polman2003neutralizing, title = {Neutralizing antibodies during treatment of secondary progressive multiple sclerosis with interferon β-1b}, journal = {Neurology}, volume = {60}, number = {1}, year = {2003}, pages = {37{\textendash}43}, publisher = {AAN Enterprises}, author = {Polman, C and Kappos, L and White, R and Dahlke, F and Beckmann, K and Pozzilli, C and Thompson, A and Petkau, J and Miller, D} }