1 Department of Neuroradiology Institut National de la Santé et de la Recherche Médicale Unite Mixte de Recherche 894 Centre Hospitalier Sainte-Anne, Université Paris-Descartes Paris, France.
2 Department of Neurology, Hemorrhagic Stroke Research Program Massachusetts General Hospital Stroke Research Center, Harvard Medical School Boston, Massachusetts.
3 Stroke Unit Istituto Di Ricovero e Cura a Carattere Scientifico Mondino Foundation Pavia, Italy.