RT Journal Article SR Electronic T1 Correction JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 576 OP 576 DO 10.1136/jnnp.2009.180075.corr1 VO 83 IS 5 YR 2012 UL http://jnnp.bmj.com/content/83/5/576.abstract AB