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Pediatr Neurosurg 2004 Mar-Apr;40(2):51-7; discussion 58
Divisions of Pediatric Neurosurgery and Pediatric Urology, Emanuel Children's Hospital, Portland, Oreg., USA.
J Neurosurg 2003 Oct;99(4):637-43
Department of Medical Informatics, University of Utah School of Medicine, Salt Lake City, Utah, USA.