RT Journal Article SR Electronic T1 Advances and Technical Standards in Neurosurgery, Volume 6 JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 376 OP 376 DO 10.1136/jnnp.43.4.376 VO 43 IS 4 A1 Hardy, DG YR 1980 UL http://jnnp.bmj.com/content/43/4/376.1.abstract AB