RT Journal Article SR Electronic T1 Correction JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 96 OP 96 DO 10.1136/jnnp.44.1.96-a VO 44 IS 1 YR 1981 UL http://jnnp.bmj.com/content/44/1/96.2.abstract AB