RT Journal Article SR Electronic T1 Epidemiology of multiple sclerosis in the counties of Northumberland and Durham JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 368 OP 376 DO 10.1136/jnnp.26.4.368 VO 26 IS 4 A1 David C. Poskanzer A1 Kurt Schapira A1 Henry Miller YR 1963 UL http://jnnp.bmj.com/content/26/4/368.abstract AB