RT Journal Article SR Electronic T1 Multiple Sclerosis JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 415 OP 415 DO 10.1136/jnnp.40.4.415 VO 40 IS 4 A1 Simpson, J. A. YR 1977 UL http://jnnp.bmj.com/content/40/4/415.1.abstract AB