RT Journal Article SR Electronic T1 Correction JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 750 OP 750 DO 10.1136/jnnp.44.8.750-b VO 44 IS 8 YR 1981 UL http://jnnp.bmj.com/content/44/8/750.3.abstract AB