1. Faculty of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
2. Department of Neurosurgery, Municipal Hospital Miguel Couto, Rio de Janeiro, Brazil
3. Faculty of Medicine, State University of Ponta Grossa, Paraná, Brazil
4. Vanderbilt University, School of Medicine, Nashville, TN, USA
5. Department of Neurology, Massachusetts General Hospital, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
6. Department of Neurosurgery, University of São Paulo, São Paulo, Brazil
7. Interventional Neuroradiology, Centre Hospitalier Universitaire de Limoges, Limoges, Limousin, France