Acute intravenous--intra-arterial revascularization therapy for severe ischemic stroke. by Hill, MD, Barber, P, Demchuk, A, Newcommon, N, Cole-Haskayne, A, Ryckborst, K, Sopher, L, Button, A, Hu, W, Hudon, M, Morrish, W, Frayne, R, Sevick, R, Buchan, A