Association between use of interferon beta and progression of disability in patients with relapsing-remitting multiple sclerosis

A Shirani, Y Zhao, ME Karim, C Evans, E Kingwell, M L {Van Der Kop}, J Oger, P Gustafson, J Petkau, H Tremlett

January 2012

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multiple-sclerosis longitudinal-data observational-data survival-analysis immortal-time-bias