1. From the Hemorrhagic Stroke Research Program, Neurology Department (G.B., A.M., A.C., J.N.G.) and Emergency Medicine Department (J.N.G.), Massachusetts General Hospital, Harvard Medical School, Boston; Neuroradiology Department, Université Paris Descartes, INSERM S894, Centre Hospitalier Sainte-Anne, France (G.B.); and Ottawa Hospital Research Institute, Canada Faculty of Medicine, University of Ottawa, Ontario (D.D.).