Diagnosis of asymptomatic natalizumab-associated PML: are we between a rock and a hard place? Wattjes MP, Vennegoor A, Mostert J, van Oosten BW, Barkhof F, Killestein J J Neurol. 2014 Apr 6. Epub 2014 Apr 06. PMID: 24705790. Abstract CommentRecommendBookmarkWatch