1. Department of Neuroradiology, Ospedale Niguarda-Ca' Granda, Milan, Italy
2. Division of Neurosurgery, Department of Neurology and Psychiatry, University of Rome: Sapienza, Rome, Italy
3. Interventional Neuroradiology, Department of Neurology and Psychiatry, University of Rome: Sapienza, Rome, Italy
4. Department of Neurology and Psychiatry, Endovascular Neurosurgery/Interventional Neuroradiology, ‘Sapienza’ University of Rome, Rome, Italy