Changes and variability of proton density and T1 relaxation times in early multiple sclerosis: MRI markers of neuronal damage in the cerebral cortex. Gracien R-M, Reitz SC, Hof S M, Fleischer V, Zimmermann H, Droby A, Steinmetz H, Zipp F, Deichmann R, Klein JC Eur Radiol. 2015 Oct 22. Epub 2015 Oct 22. PMID: 26494641. Abstract CommentRecommendBookmarkWatch