Editors' Pick Risk Factors Associated with the Onset of Relapsing-Remitting and Primary Progressive Multiple Sclerosis: A Systematic Review. McKay KA, Kwan V, Duggan T, Tremlett H Biomed Res Int. 2015; 2015:817238. Epub 2015 Jan 31. PMID: 25802867. Abstract CommentRecommendBookmarkWatch