RT Journal Article SR Electronic T1 Operative Neurosurgery JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 972 OP 972-b DO 10.1212/WNL.14.10.972-b VO 14 IS 10 A1 A. EARL WALKER YR 1964 UL http://n.neurology.org/content/14/10/972.3.abstract AB