A dam for retrograde axonal degeneration in multiple sclerosis? Balk L, Twisk JWR, Steenwijk MD, Daams M, Tewarie P, Killestein J, Uitdehaag BMJ, Polman CH, Petzold A J Neurol Neurosurg Psychiatry. 2014 Jan 28. PMID: 24474822. Abstract CommentRecommendBookmarkWatch