Sex ratio of multiple sclerosis in Canada: a longitudinal study. Orton S-M, Herrera BM, Yee IM, Valdar W, Ramagopalan SV, Sadovnick DA, Ebers GC, Canadian Collaborative Study Group Lancet Neurol. 2006 Nov; 5(11):932-6. PMID: 17052660. Abstract CommentRecommendBookmarkWatch