Marginal Structural Cox Models for Estimating the Association Between β-Interferon Exposure and Disease Progression in a Multiple Sclerosis Cohort. Karim M E, Gustafson P, Petkau J, Zhao Y, Shirani A, Kingwell E, Evans C, van der Kop M, Oger J, Tremlett H Am J Epidemiol. 2014 Jun 17. PMID: 24939980. Abstract CommentRecommendBookmarkWatch