RT Journal Article SR Electronic T1 Books Received JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 90 OP 90 DO 10.1136/jnnp.23.1.90 VO 23 IS 1 YR 1960 UL http://jnnp.bmj.com/content/23/1/90.abstract AB