Penumbral imaging and functional outcome in patients with anterior circulation ischaemic stroke treated with endovascular thrombectomy versus medical therapy: a meta-analysis of individual patient-level data. - Campbell BCV; Majoie CBLM; Albers GW; Menon BK; Yassi N; Sharma G; van Zwam WH; van Oostenbrugge RJ; Demchuk AM; Guillemin F; White P; Dávalos A; et al. (The Lancet. Neurology, 2019)