The Utility of Administrative Data for Surveillance of Comorbidity in Multiple Sclerosis: A Validation Study. Marrie R A, Yu B N, Leung S, Elliott L, Caetano P, Warren S, Wolfson C, Patten SB, Svenson LW, Tremlett H, et al. Neuroepidemiology. 2012 Oct 23; 40(2):85-92. Epub 2012 Oct 24. PMID: 23095571. Abstract CommentRecommendBookmarkWatch