RT Journal Article SR Electronic T1 Correction for vol. 69, p. 308 JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 425 OP 425 VO 70 IS 3 YR 2001 UL http://jnnp.bmj.com/content/70/3/425.abstract AB