RT Journal Article SR Electronic T1 Spinal cord atrophy and disability in multiple sclerosis over four years JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 1014 OP 1015 DO 10.1136/jnnp.74.8.1014-a VO 74 IS 8 A1 M A Horsfield A1 M Filippi YR 2003 UL http://jnnp.bmj.com/content/74/8/1014.2.abstract AB