TY - JOUR T1 - Correction JF - Journal of Neurology, Neurosurgery & Psychiatry JO - J Neurol Neurosurg Psychiatry SP - 240 LP - 240 DO - 10.1136/jnnp.20.3.240 VL - 20 IS - 3 A2 - , Y1 - 1957/08/01 UR - http://jnnp.bmj.com/content/20/3/240.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -