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Annotated bibliography.
N Altman, R S Boyer, J A Brunberg, A D Elster, A E George, D B Hackney, V M Haughton, R B Lufkin, J S Ross, J D Swartz, J L Weissman and S M Wolpert
American Journal of Neuroradiology September 1997, 18 (8) 1597-1599;