%0 Journal Article %A R. Agid %A T. Andersson %A H. Almqvist %A R.A. Willinsky %A S.-K. Lee %A K.G. terBrugge %A R.I. Farb %A M. Söderman %T Negative CT Angiography Findings in Patients with Spontaneous Subarachnoid Hemorrhage: When Is Digital Subtraction Angiography Still Needed? %D 2009 %R 10.3174/ajnr.A1884 %J American Journal of Neuroradiology %U https://www.ajnr.org/content/ajnr/early/2009/11/26/ajnr.A1884.full.pdf