RT Journal Article SR Electronic T1 Lumbar Disc Herniation JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 699 OP 699 DO 10.1136/jnnp.67.5.699a VO 67 IS 5 A1 LAING, RODNEY YR 1999 UL http://jnnp.bmj.com/content/67/5/699.2.abstract AB