RT Journal Article SR Electronic T1 The Cost of Closure JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A1990 A1 H.J. Cloft YR 2010 UL http://www.ajnr.org/content/early/2010/01/14/ajnr.A1990.abstract AB