RT Journal Article SR Electronic T1 ABN Abstracts JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 1014 OP 1038 VO 78 IS 9 YR 2007 UL http://jnnp.bmj.com/content/78/9/1014.abstract AB