The risk of smoking on multiple sclerosis: a meta-analysis based on 20,626 cases from case-control and cohort studies. Zhang P, Wang R, Li Z, Wang Y, Gao C, Lv X, Song Y, Li B PeerJ. 2016; 4:e1797. Epub 2016 Mar 15. PMID: 27014514. Abstract CommentRecommendBookmarkWatch