Negative CT Angiography Findings in Patients with Spontaneous Subarachnoid Hemorrhage: When is Digital Subtraction Angiography Still Needed?
AJNR 31:695-705, Agid,R., et al, 2010
Inborn Errors of Metabolism as a Cause of Neurological Disease in Adults: An Approach to Investigation
JNNP 69: 5-12, Gray,R.G.F. et al, 2000