The efficacy and safety of natalizumab for the treatment of multiple sclerosis in Portugal: a retrospective study. Sousa L, de Sa J, Sa MJ, Cerqueira JJ, Martins-Silva A, En Nombre Del Portugal Experience With Natalizumab Study Group Snapshot E N D P E W N S Rev Neurol. 2014 Nov 1; 59(9):399-406. PMID: 25342053. Abstract CommentRecommendBookmarkWatch