Interferon beta and long-term disability in multiple sclerosis A Shirani, Y Zhao, ME Karim, C Evans, E Kingwell, ML {Van Der Kop}, J Oger, P Gustafson, J Petkau, H Tremlett January 2013 Source Document multiple-sclerosis longitudinal-data observational-data survival-analysis Related Association between use of interferon beta and progression of disability in patients with relapsing-remitting multiple sclerosis