1. Stroke Center, Neurology Service, Department of Clinical Neurosciences, Lausanne University Hospital, University of Lausanne, 1011 Lausanne, Switzerland
2. Neurology Unit, Department of Internal Medicine, Riviera Chablais Hospital, 1847 Rennaz, Switzerland
3. Statistical Unit, Regional House of Clinical Research, University of Lille, CHU Lille, EA 2694—Santé Publique: Épidémiologie et Qualité des Soins, 59000 Lille, France
4. Stroke Center, Neurology Service, Ospedale Civico di Lugano, 6900 Lugano, Switzerland
5. Diagnostic and Interventional Radiology Service, Lausanne University Hospital, University of Lausanne, 1011 Lausanne, Switzerland
6. Department of Diagnostic and Interventional Radiology, Neuroradiology Division, Stanford University and Medical Center, Stanford, CA 94305, USA