RT Journal Article SR Electronic T1 Redefining “Normal” JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1182 OP 1183 VO 21 IS 7 A1 Ball Jr., William S. YR 2000 UL http://www.ajnr.org/content/21/7/1182.abstract AB