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Flowchart of the study population. NIHSS: National Institutes of Health Stroke Scale; CTA: computed tomography angiography; MRA: magnetic resonance angiography; DSA: digital subtraction angiography; AIS: acute ischemic stroke; N-AIS: nonacute ischemic stroke; ELVO: emergent large vessel occlusion; NELVO: non-emergent large vessel occlusion; ICH: intracerebral hemorrhage.
