Commentary on the Article of C. Woertgen, O. W. Ullrich, R. D. Rothoerl, A. Brawanski: Comparison of the Claassen and Fisher CT Classification Scale to Predict Ischemia after Aneurysmatic SAH - Claassen, J; Kreiter, KT; Mayer, SA (Zentralblatt für Neurochirurgie, 2004)