Simpson R K, Azordegan P A, Sirbasku D M, Weathers S W, Lidsky M D, Baskin D S
Department of Neurosurgery, Veterans Administration Hospital, Baylor College of Medicine, Houston, Texas.
Spine (Phila Pa 1976). 1991 Aug;16(8):1002-5. doi: 10.1097/00007632-199108000-00030.