RT Journal Article SR Electronic T1 David, Enderby and Bainton reply JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 692 OP 693 DO 10.1136/jnnp.46.7.692 VO 46 IS 7 YR 1983 UL http://jnnp.bmj.com/content/46/7/692.abstract AB